01 -
Preheat oven to 177°C. Spray a 23 cm x 33 cm pan with baking spray and set aside.
02 -
In a small saucepan, combine butter, bittersweet chocolate, and black cocoa powder. Heat and stir over low heat until fully melted and smooth. Allow to cool slightly.
03 -
In a stand mixer fitted with a paddle attachment, mix eggs, granulated sugar, and vanilla extract on low for 1 minute. Increase to high speed and beat for 10 minutes until light and thickened.
04 -
Pour the cooled chocolate mixture into the egg mixture and mix until homogeneous. Add flour and blend on low just until incorporated.
05 -
Transfer batter to the prepared pan. Smooth the top. Bake for 30–35 minutes until baked through but still moist, or until a cake tester shows just a few moist crumbs.
06 -
Let brownies cool completely in the pan. Cut into 16 rectangles.
07 -
In a microwavable bowl, combine bittersweet chocolate and coconut oil. Microwave in 15-second intervals, stirring between each, until melted and smooth. Whisk in black cocoa powder until mixture is completely fluid and glossy.
08 -
Transfer the chocolate mixture to a piping bag. Pipe decorative details onto each brownie to create a spellbook effect. Place a dot of chocolate for each candy eye and attach firmly. Allow decorations to set before serving.