Easy St. Patrick's Day Mint Oreo Brownies
Fudgy dark chocolate brownies layered with crushed Mint Oreos and topped with a vibrant emerald peppermint frosting. This festive St. Patrick's Day dessert is rich, indulgent, and ready in under 45 minutes — perfect for holiday celebrations.
Equipment
- 8x8-inch baking pan
- mixing bowls
- whisk
- spatula
- electric mixer for frosting
Ingredients
- 1/2 cup unsalted butter
- 4 oz dark chocolate (60–70% cacao), chopped
- 1 cup granulated sugar
- 2 large eggs
- 1 egg yolk
- 1 tsp pure vanilla extract
- 1/4 tsp pure peppermint extract
- 3/4 cup all-purpose flour
- 1/4 cup Dutch-process cocoa powder
- 1/2 tsp salt
- 16 Mint Oreo cookies, roughly crushed
- 1/2 cup unsalted butter, softened (for frosting)
- 2 1/2 cups powdered sugar, sifted
- 2–3 tbsp heavy cream
- 1 tsp pure peppermint extract (for frosting)
- green gel food coloring
- pinch salt (for frosting)
- 6–8 additional Mint Oreos for garnish (optional)
- flaky sea salt for finishing (optional)
Instructions
- Preheat oven to 350°F. Line an 8x8-inch baking pan with parchment paper and lightly grease.
- Melt butter and chopped dark chocolate together over a double boiler or in short microwave bursts until smooth. Cool slightly.
- Whisk sugar into chocolate mixture. Add eggs and yolk one at a time, whisking well after each. Stir in vanilla and peppermint extract.
- Fold in flour, cocoa powder, and salt just until combined. Do not overmix.
- Spread half the batter into pan. Press crushed Mint Oreos evenly over the layer. Cover with remaining batter and smooth top.
- Bake 22–26 minutes until a toothpick shows moist crumbs. Cool completely, then chill 20 minutes before frosting.
- Beat softened butter for frosting until fluffy. Add powdered sugar gradually. Mix in peppermint extract, salt, and heavy cream until smooth. Tint with green gel coloring until vivid emerald.
- Spread frosting over cold brownies. Garnish with additional crushed Oreos and flaky salt if desired. Chill 15 minutes before slicing into squares.
Notes
Do not overbake — brownies are done when a toothpick shows moist crumbs. Cool completely before frosting. Use gel food coloring for vivid green without thinning the frosting. For clean slices, use a hot knife wiped between cuts.