Spray square and circle cake pans with cooking spray.
Line round cake pan with parchment paper. I do this by setting the cake pan on a piece of parchment paper and tracing it with a pen, then cutting out the circle.
Spray parchment paper with cooking spray.
Preheat oven to 350.
Make cake batter (you could use this chocolate cake or this maple syrup cake. Divide batter evenly between square and round baking dishes.
Bake until done.
While cake is baking, make the frosting.
Remove cakes from oven and allow to cool completely on a wire cooling rack.
Cut the circle down the middle.
Put the square cake on a plate, diagonally, and then add the 1/2 circles to form the heart.
Frost the cake and enjoy.