The definitive marijuana brownie recipe

Marijuana brownies are legendary among cannabis edibles for several reasons: they're easy to make, devilishly good and lift you up to the sky. Even if you're a complete disaster in the kitchen, this marijuana brownie recipe is worth a try.

Bear in mind this is informational content, based on a typical recipe from popular cannabis culture. If you choose to ingest marijuana, you do so entirely at your own responsibility. Cannactiva products are not intended for ingestion.

The 3 key takeaways

• A brownie serving with 4 g of buds can deliver between 25 and 50 mg of real THC depending on whether the marijuana is 10% or 20% THC. Start with half a serving if it's your first time.
• The effect takes 45-90 minutes to kick in and lasts between 4 and 8 hours. Never go back for seconds just because "you don't feel anything yet".
• For a more relaxing version with minimal THC, there are CBD flowers and CBD small buds.

How to make a marijuana brownie

If you're after an easy marijuana brownie recipe, you've come to the right place. It's one of the most popular cannabis desserts — what some circles call a crazy brownie, magic brownie or happy brownie — and a true classic at birthday parties among friends, special celebrations, or even any lazy, boring afternoon. Who hasn't tried a weed cake made by a mate who fancied themselves a chef? And who would have thought that today, that friend is you!

Tips before cooking with marijuana

Before you dive into the recipe, three things worth keeping in mind:

• Be cautious with the quantities. There's no recommended average dose: every body reacts differently to cannabis. Work out the grams of bud per serving carefully before you start.
• Ingested marijuana kicks in later, but hits much harder than when smoked. The high can take around an hour to appear; take it easy and don't go back for more just because "you don't feel anything": the high will land all at once.
• If it's your first time, eat a small amount. This applies to anyone sharing the brownie with you too: start with half a serving and wait to see how it affects you.

If you're interested in cannabis's relaxing effect but want a strain with minimal THC, learn more about CBD flowers and CBD small buds.

Watch the oven temperature

A key aspect when cooking with marijuana is controlling the temperature: it should never exceed 120 ºC. Heat activates the cannabinoids through a process called decarboxylation, through which THCA and CBDA convert into their active forms (THC and CBD).

THC starts to release from 104 ºC and completes its decarboxylation in around 45 minutes. Above 150 ºC, or at 120 ºC for more than an hour, cannabinoids begin to degrade: THC converts into CBN, which has much less psychoactive potency.

In short: cook low and slow. The grill setting and high temperatures are the fastest way to ruin the brownie's effect.

Cannabis butter or buds straight in?

Both options work, but they don't deliver the same result:

• With cannabis butter: the classic option and the most efficient. Cannabinoids are fat-soluble, so warm fat draws them out to the maximum during a 2-4 hour infusion. Result: a more uniform effect across servings, a more balanced flavour and a higher concentration of active THC/CBD.
• With ground bud straight into the batter: you save yourself preparing the butter separately, but extraction is less efficient and the herbal flavour comes through much more. The oven heat partially decarboxylates the THCA during the 60-minute bake, so you'll get an effect, but not the full potency you'd get with butter.

If it's your first time, better with cannabis butter: dose control per serving is far more reliable. We've got the step-by-step guide for preparing it at home.

Ingredients for the marijuana brownie

Note down these ingredients for a marijuana brownie that serves 8:

• 125 g of cannabis butter — or, if you'd rather not prepare the butter beforehand: 125 g of regular butter + 4-5 g of ground decarboxylated buds (you add them together in Step 2). To calculate the exact dose, see the "Dosage, timing and effects" section below.
• 4 eggs
• 100 g of flour
• 150 g of sugar
• 200 g of melting chocolate, 70% cocoa or higher
• 100 g of chopped walnuts
• 1 teaspoon of ground cinnamon (optional)
• 1 teaspoon of vanilla extract (optional, rounds out the flavour)
• A pinch of salt

Step-by-step marijuana brownie recipe

Recipe details

• Servings: 8
• Prep time: 20 min
• Oven: 50-60 min
• Cooling: 30 min
• Total: approx. 1 h 50 min
• Tin: rectangular, 20×25 cm
• Difficulty: medium

Step 1 — Decarboxylate the marijuana (only if you don't have cannabis butter)

If you're going to use buds straight into the recipe instead of pre-made butter, you first need to activate the cannabinoids:

• Lightly grind the buds (without pulverising them) and spread them on a baking tray lined with greaseproof paper.
• Bake in the middle of the oven (never near the grill), at 110-120 ºC for 30-40 minutes.
• Let them cool completely and grind the buds with a grinder until uniform.

If you already have cannabis butter prepared, skip this step and go straight to Step 2.

Step 2 — Melt the cannabis butter and chocolate over a bain-marie

• Break the 200 g of chocolate into small pieces so it melts evenly.
• Heat water in a small saucepan until it's gently simmering.
• Place a bowl on top (without touching the water) and add the 125 g of cannabis butter and the chopped chocolate.
• Buds-direct version: instead of cannabis butter, use 125 g of regular butter + the 4-5 g of ground decarboxylated buds from Step 1, all together. The warm fat from the bain-marie will draw out part of the cannabinoids; the rest finishes extracting during baking.
• Stir with a wooden spoon, without rushing, until both ingredients are completely melted and the mixture is glossy.

When it's done, turn off the heat, remove the bowl and cover it with a plate: this way the volatile cannabis terpenes don't evaporate while it cools. Set aside.

Preheat the oven to 120 ºC now, not later.

Step 3 — Beat eggs, sugar and spices

In another large bowl:

• Crack the 4 eggs and add the 150 g of sugar.
• Beat with a whisk (or a fork) for 3-4 minutes, until the mixture doubles in volume and turns light and frothy.
• Fold in the teaspoon of ground cinnamon, the teaspoon of vanilla extract and the pinch of salt. Mix well.

Step 4 — Fold in the sifted flour

• Sift the 100 g of flour directly into the bowl with the beaten eggs (this stops lumps forming).
• Mix with folding motions from the bottom up, with a spatula or spoon. Don't overmix: the batter should be smooth but airy.

Step 5 — Combine the cannabis chocolate and add the walnuts

• Make sure the cannabis chocolate mixture is warm (hot but not boiling). If it's too hot, it would cook the eggs.
• Pour the chocolate over the flour and egg batter, mixing gently until the colour is uniform.
• Add the 100 g of chopped walnuts and mix with two or three folding motions (no more, so they stay whole).

Step 6 — Bake low and slow

• Line a rectangular tin (approx. 20×25 cm) with greaseproof paper or grease it with a few drops of oil/butter.
• Pour in the batter and smooth the surface with the spatula.
• Place the tin in the middle of the oven and bake at 100-120 ºC for 50-60 minutes.

⚠️ Don't turn up the temperature or switch on the grill: above 150 ºC THC degrades into CBN and loses psychoactive potency. Better to cook low and a little longer.

Check with a skewer at 50 minutes: when it comes out just barely moist (not liquid), the brownie is ready. If it's still raw in the centre, give it 5-10 more minutes.

Let it cool in the tin for at least 30 minutes before cutting. The brownie keeps cooking with the residual heat and the texture improves as it settles.

Fancy giving the recipe a go? If you put it into action, we'd love to see how it turns out. Send us a photo of the result to info@cannactiva.com or tag us on Instagram @cannactiva_es — we share the best ones on our channels and celebrate the recipes of the cannactivist community.

Dosage, timing and effects of the marijuana brownie

Here's the section that raises the most questions: how much marijuana to put in, how long it takes to kick in, and how long the high lasts. Read carefully before eating.

How long does a marijuana brownie take to kick in?

The effect of cannabis edibles appears between 45 and 90 minutes after eating, and reaches its peak 2-3 hours later. It's not like smoking (effect within 5-10 min): THC passes through the liver, converts into 11-hydroxy-THC (more psychoactive) and enters the bloodstream slowly.

That's why the golden rule is: wait at least 90 minutes before eating more. The vast majority of green-outs happen because someone "wasn't feeling anything" and ate another serving.

How long does the marijuana brownie effect last?

The high lasts 4-8 hours in most people, and can stretch to 10-12 hours in those who metabolise THC more slowly. Compared with smoking (1-3 h), the edible is much longer and far more intense.

Drink water, don't mix with alcohol and make sure you've got a comfortable spot to lie down. If it's your first time, better at home with someone sober nearby.

How much marijuana goes into a brownie?

Before you check the table, two important clarifications:

1. Not all the THC in the bud ends up in your brownie. Between decarboxylation, extraction into the fat and the bake itself, real efficiency usually ranges between 40% and 70% depending on temperature, time and the way it's mixed. In home cooking, a reasonable estimate is to assume approx. 50% efficiency.

2. The THC percentage of your bud changes the result a lot. Today's marijuana runs from 8% to 25% THC; CBD hemp flower barely reaches 0.3% THC but can have up to 22% CBD. Check your product label before you start calculating.

Quick examples (approx. 50% efficiency, 8 servings):

🌿 Medium-strength marijuana (4 g × 10% THC). 400 mg crude THC → 200 mg active → approx. 25 mg of THC per serving. Medium dose.

💪 Strong marijuana (4 g × 20% THC). 800 mg crude THC → 400 mg active → approx. 50 mg of THC per serving. High dose: risk of greening out if you don't have tolerance.

🌱 CBD flower (4 g × 18% CBD + 0.2% THC). 720 mg CBD + 8 mg crude THC → 360 mg CBD + 4 mg active THC → approx. 45 mg of CBD + < 1 mg of THC per serving. Relaxing effect with no high.

Indicative table (active mg per serving, approx. 50% efficiency, 8 servings):

• 2 g · mild marijuana · 10% THC → approx. 12 mg THC. Mild.
• 4 g · medium marijuana · 10% THC → approx. 25 mg THC. Medium.
• 4 g · strong marijuana · 20% THC → approx. 50 mg THC. High (green-out risk).
• 5 g · very strong marijuana · 25% THC → approx. 78 mg THC. Very high (genuinely dangerous).
• 4 g · CBD flower · 0.2% THC + 18% CBD → < 1 mg THC + approx. 45 mg CBD. Relaxing, no high.

The values are estimates; real potency depends on the quality of the decarboxylation, the fat content of the recipe and each person's metabolism. Below 10 mg of real THC per serving is considered a low dose; 10-25 mg is medium; above 25 mg is high.

If you'd rather a version without the high: CBD brownie

For a version that's legal, non-psychoactive and with no green-out risk, you can make the same brownie swapping the marijuana buds for CBD flowers. The process is identical:

• Decarboxylate the CBD flowers the same way (110-120 ºC, 30-40 min).
• Grind them and add them to the butter.
• Bake at the same temperature.

The result: a brownie with the same herbal aroma and the characteristic relaxation of CBD, without the THC "high". It's the ideal option for an after-dinner share with no surprises, an introductory cannabis experience, or replacing the smoking ritual with something more discreet.

Our recommendation for this version: indoor CBD flowers (Candy Krush, Marula or Vibration are good candidates thanks to their sweet, citrus terpenes, which pair beautifully with chocolate).

Frequently asked questions about marijuana brownies

Is it legal to make marijuana brownies in Spain?

Preparing cannabis edibles for personal use in a private space sits in a legal grey area: it isn't actively prosecuted, but selling, transporting or consuming it in public can carry administrative fines or criminal sanctions (see our guide on CBD fines in Spain). With CBD flowers (<0.3% THC) the situation is different: the product is legal as industrial hemp flower.

What happens if I eat too much marijuana brownie?

You can suffer a green-out: dizziness, racing heart, anxiety, paranoia, nausea and disorientation. It's not dangerous (no one has ever died from a THC overdose), but it's very unpleasant. Drink water, lie down in a dark place, breathe slowly and wait. It passes within 2-6 hours.

Can I make the brownie with CBD flowers only?

Yes, the process is the same: decarboxylate the flowers, infuse the butter (or mix regular butter with the ground flowers) and bake low. You'll get a brownie with a cannabis flavour and a relaxing effect. In numbers, using 4 g of CBD flower (18% CBD, < 0.2% THC) each serving has less than 1 mg of THC (compared with the 25-50 mg of a 10-20% marijuana version) and around 45 mg of CBD.

How long do marijuana brownies keep?

In the fridge, well covered: 5-7 days. Cannabinoids are fat, so they keep nicely in the butter. Label them clearly to avoid accidents with children, pets or other people.

Can I freeze the brownies?

Yes. They lose a little texture but keep almost all their potency for up to 3 months. Wrap them individually in clingfilm and store in an airtight container.

Our recommendation

If you've enjoyed the ritual of cooking with cannabis and want to explore more strains, here are our four CBD flower picks for this season:

Why Cannactiva?

• 🧪 Lab analysis available as a downloadable PDF on every product
• 🚚 24h delivery across mainland Spain, free from €50
• 🔄 30-day guarantee: if you don't feel the effect, we refund your money
• ⭐ 4.8/5 with 15,000+ verified reviews
• 🌿 CBD specialists since 2018, based in Barcelona

Finally, if you share your home with other people, we advise warning them about what's in the cake and, above all, keeping it well out of reach of small children and pets. And if you're home alone, put a label or sign on it that clearly says it's a marijuana brownie, to avoid accidents. If you let your guard down, someone with a sweet tooth could polish off the whole brownie and have adverse effects.

Cannactiva's CBD flowers are marketed as industrial hemp products for external use. Any preparation or consumption other than that remains entirely the user's responsibility.