For the cake
- 1 teaspoon(s) baking powder
- 40 g cocoa powder, +extra for the mold
- 200 g self-rising flour
- 200 g butter, at room temperature + extra for the mold
- 200 g granulated sugar
- 1 teaspoon(s) vanilla extract
- 2 eggs, at room temperature
- 1 egg yolk
- 40 g strained yogurt
For the buttercream
- 200 g butter, at room temperature
- 60 g cocoa powder
- 1 teaspoon(s) vanilla extract
- 500 g icing sugar
- 50 g milk, whole