Ingredients
- 1 1/2 cups all-purpose flour
- 1/4 cup unsweetened cocoa powder
- 1/2 teaspoon baking powder
- 1/4 teaspoon baking soda
- 1/4 teaspoon salt
- 1/3 cup milk
- 1 tablespoon instant espresso powder
- 1/2 teaspoon pure vanilla extract
- 6 tablespoons unsalted butter, at room temperature
- 3/4 cup granulated sugar
- 1 large egg
- 6 ounces mascarpone cheese, at room temperature
- 4 ounces cream cheese, at room temperature
- 1/3 cup confectioners' sugar, sifted, plus more for dusting
- 1/2 teaspoon pure vanilla extract
- 1 tablespoon coffee liqueur, such as Kahlua
- 1 teaspoon instant espresso powder
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