How to Make Cannabis Brownies | UK Guide to Edibles

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How to Make Cannabis Brownies

Cannabis brownies are one of the most popular ways to consume cannabis edibles. They’re discreet, long-lasting, and easy to make once you understand the basics. But making them properly—so they’re effective and not overwhelming—takes more than just adding weed to a cake mix.

Here’s a full breakdown of how to safely and effectively make cannabis brownies from scratch in the UK.

Legal Disclaimer (UK)

Cannabis remains a Class B controlled substance under UK law. Possession, production, and supply of cannabis—whether for recreational use or in edibles—is illegal unless prescribed medicinally or licensed. This guide is for educational purposes only.

What You’ll Need

Ingredients for Cannabutter:

  • 7–10g dried cannabis flower (adjust based on strength)

  • 250g unsalted butter

  • 500ml water

Ingredients for Brownies:

  • 120g cannabutter (from above)

  • 200g caster sugar

  • 2 large eggs

  • 1 tsp vanilla extract

  • 50g cocoa powder

  • 100g plain flour

  • Pinch of salt

  • Optional: chocolate chips, walnuts

Step 1: Decarboxylate the Cannabis

This step is crucial. Raw cannabis won’t get you high unless you decarboxylate it—activating the THC.

  1. Preheat oven to 110–120°C (low and slow is best).

  2. Break cannabis into small pieces (not powdered).

  3. Spread on a baking tray lined with parchment paper.

  4. Bake for 30–40 minutes, stirring halfway through.

  5. Let it cool—it’s now ready for infusion.

Step 2: Make Cannabutter

  1. In a saucepan, bring 500ml of water and 250g butter to a gentle simmer.

  2. Add the decarboxylated cannabis.

  3. Simmer on low heat for 2–3 hours, stirring occasionally. Do not boil.

  4. Strain the mixture through cheesecloth into a bowl or container.

  5. Let cool, then refrigerate. The butter will solidify and separate from the water—remove and keep the top layer.

Store cannabutter in an airtight container in the fridge. It can last up to 2 weeks, or longer if frozen.

Step 3: Bake the Brownies

  1. Preheat oven to 170°C (fan 160°C).

  2. Melt 120g of cannabutter in a pan or microwave.

  3. In a mixing bowl, whisk together sugar, eggs, and vanilla.

  4. Add melted butter and mix well.

  5. Fold in flour, cocoa powder, salt, and optional extras like chocolate chips.

  6. Pour into a greased 8-inch square baking tin.

  7. Bake for 20–25 minutes, or until a skewer comes out with moist crumbs (not wet).

  8. Let cool completely before cutting.

Dosing & Safety Tips

  • If you're new to edibles, start with a small portion (around 1/16 of the tray).

  • Edibles take 30–90 minutes to kick in—don’t double dose if you don’t feel it right away.

  • The effects can last 4–8 hours or more.

  • Store securely and clearly label to prevent accidental consumption.

Final Word

Making cannabis brownies at home requires a bit of science—decarboxylation and accurate dosing are key. Whether for medical use where legally permitted, or purely for educational understanding, knowing how to make edibles safely is essential.

Just remember: start low, go slow, and always store responsibly.