Ingredients:
- 4 tablespoons unsalted butter, melted and cooled slightly, plus more for greasing
- 3/4 cup plus 2 tablespoons cake flour
- 3/4 teaspoon baking powder
- 1/4 teaspoon fine salt
- 2 large eggs
- 2/3 cup granulated sugar
- 1 tablespoon milk
- 3/4 teaspoon vanilla extract
- 1/2 cup confectioners’ sugar
- 1/2 cup coffee liqueur, such as Tia Maria
- 1 tablespoon instant espresso powder
- 1 tablespoon unsweetened cocoa powder
- 1/4 cup hot water
- 1 cup mascarpone cheese, at room temperature
- 1/2 cup heavy cream
- Cocoa powder or chocolate shavings, for garnish, optional