Rich, fudgy brownies topped with a smooth and airy chocolate mousse layer — the ultimate layered chocolate dessert.
Brownie Layer:
½ cup unsalted butter
4 oz semi-sweet chocolate
¾ cup granulated sugar
¼ cup brown sugar (optional)
2 eggs
1 tsp vanilla extract
½ cup all-purpose flour
¼ tsp salt
Mousse Layer:
6 oz semi-sweet or dark chocolate
1 cup heavy cream
2 tbsp powdered sugar (optional)
1 tsp vanilla extract
1 tsp unflavored gelatin + 1 tbsp cold water (optional)
Preheat oven to 350°F. Line an 8×8-inch pan with parchment.
Melt butter and chocolate. Stir in sugars, eggs, vanilla, then flour and salt.
Bake 22–25 minutes. Cool completely.
Melt chocolate and let cool. Whip cream, sugar, and vanilla to stiff peaks.
Fold in cooled chocolate. Add dissolved gelatin if using.
Spread mousse over brownies. Chill 2+ hours to set.
Dust with cocoa or decorate. Slice and serve.
Store in fridge 4–5 days or freeze up to 1 month. Use boxed brownies for a shortcut.