Irresistible Tiramisu Brownies with 2 Coffee Layers

Preheat oven to 350°F (175°C). Grease a 9×13-inch baking pan.
Melt butter in a saucepan. Stir in sugar, eggs, and vanilla.
Sift flour, cocoa powder, and salt together. Fold into wet ingredients.
Dissolve instant coffee in brewed coffee. Mix into batter.
Spread batter evenly in pan. Bake for 25 minutes.
Beat mascarpone and powdered sugar until smooth.
Spread mascarpone layer over cooled brownies.
Dust with cocoa powder before serving.
Notes
Use room-temperature eggs for better mixing.
Let brownies cool completely before adding mascarpone.
Store leftovers refrigerated.