01 -
Preheat the oven to 350°F (175°C). Grease and line an 8×8-inch baking pan with parchment paper.
02 -
In a medium bowl, whisk together the melted butter and sugar until smooth and well combined. Add the eggs and vanilla extract, mixing well. In another bowl, whisk together the flour, cocoa powder, baking powder, and salt. Gradually add the dry ingredients to the wet ingredients, mixing until just combined. Fold in the chocolate chips if using. Pour the brownie batter into the prepared pan and spread it evenly. Bake for 18-22 minutes or until a toothpick inserted into the center comes out with a few moist crumbs (not wet batter). Let the brownies cool completely in the pan on a wire rack.
03 -
In a large mixing bowl, whisk together the mascarpone cheese, heavy cream, powdered sugar, espresso (or coffee), and vanilla extract until smooth and creamy. You can use a hand mixer or stand mixer for quicker results. Once the brownies are completely cooled, spread the tiramisu layer evenly over the brownie base. Use a spatula to smooth the top.
04 -
Refrigerate the brownies for at least 2 hours, or until the tiramisu layer is firm and set. This step allows the flavors to meld together.
05 -
Before serving, dust the top of the tiramisu layer with unsweetened cocoa powder. Slice into squares and enjoy!