Best Tiramisu Cake Recipe - How To Make Tiramisu Cake

Ingredients

• Cooking spray
• 1 1/2 c. all-purpose flour
• 1 1/2 tsp. baking powder
• 1/2 tsp. kosher salt
• 5 large eggs, separated
• 1 1/4 c. granulated sugar, divided
• 1 tsp. pure vanilla extract
• 1/2 c. milk
• 4 tbsp. melted butter, cooled
• 1/2 c. strong brewed coffee
• 1 tbsp. dark rum
• 1 1/2 c. (3 sticks) butter, softened
• 8 oz. mascarpone, room temperature
• 3 c. powdered sugar
• 1/4 c. heavy cream
• 2 tbsp. cocoa powder, for garnish