Tiramisu Cupcakes

Ingredients

• 6 Tablespoons (85g) unsalted butter (at room temperature)
• ¾ cup (151g) granulated sugar
• 1 large egg + 1 large egg white
• ½ teaspoon vanilla extract
• 1 teaspoon vanilla bean paste
• 1⅔ cup (190g) cake flour
• 1 teaspoon baking powder
• 1 ¾ teaspoons baking soda
• ¼ teaspoon salt
• ¾ cup (186mL) buttermilk
• ¼ cup (50g) granulated sugar
• ¼ cup (57g) water
• 1½ teaspoons espresso liqueur
• 1 teaspoon instant espresso powder
• 1½ cups (365g) heavy cream
• 1 cup (120g) powdered sugar
• 6½ oz (180g) cream cheese
• 8 oz (226g) mascarpone
• 1 Tablespoon espresso powder
• 1 Tablespoon vanilla extract
• 1 Tablespoon espresso liqueur (optional)
• cocoa powder (for dusting on top)