Tiramisu Cake

Gather the ingredients. Preheat the oven to 350 degrees F (175 degrees C). Grease and flour three 9-inch pans.

To make the cake: Beat cake mix, water, egg whites, and oil in a large bowl with an electric mixer on medium speed until well combined, about 2 minutes. Divide 2/3 of the batter between 2 prepared pans. Stir instant coffee into remaining batter; pour into the remaining prepared pan.

Bake in the preheated oven until a toothpick inserted into the center of cakes comes out clean, 23 to 28 minutes. Cool cakes in the pans for 10 minutes, then turn out onto a wire rack to cool completely.