Tiramisu Sandwich Cookies – Catalina Cooks

Ingredients

• 2/3 cup all-purpose flour
• 1 tablespoon espresso powder
• 1/2 teaspoon baking powder
• 1/2 teaspoon salt
• 2 cups semi-sweet baking chips
• 6 ounces unsweetened baking chocolate
• 3/4 cup (1 1/2 sticks) unsalted butter
• 6 large eggs, at room temperature
• 2 cups granulated sugar
• 1 tablespoon vanilla extract​
• 1 teaspoon espresso powder
• 3 tablespoons strong black coffee, warm
• 1/2 cup (1 stick) unsalted butter
• 3 cups confectioners’ sugar, sifted
• 8 ounces mascarpone cheese, at room temperature