To Prep: Preheat oven to 350°F and grease and flour a round cake pan and square cake pan.
Prepare cake batter according to package directions.
Pour batter into the prepared round pan and square baking pan, diving the batter evenly.
Bake according to the box instructions for 2 round pans.
Remove cakes from oven. Allow cakes to cool enough to handle, then shake the pans gently to loosen the cakes and flip carefully onto a wire cooling rack.
Cut the round cake in half.
Assemble the cooled cake pieces to form a heart shape.
Frost and decorate.
How to Make Homemade Vanilla Buttercream:
Beat butter until smooth and creamy.
Add the powdered sugar, vanilla, and cream and beat for 2 minutes, scraping the sides of bowl as needed. Continue mixing until stiff peaks form.
If the frosting is too thick to spread, mix in a splash of milk or cream. If the frosting is too runny, mix in more powdered sugar.
Optional: mix in a few drops of pink food coloring.
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Notes
Nutrition information is provided as an estimate only and will vary based on exact ingredients used and serving size.Prep Tips:
Use the same batter: One standard 15.25 oz box of cake mix is perfect for both pans and helps the cakes bake evenly.
Prep your pans: Grease and line pans with parchment paper for easy release.
Fill evenly: Divide batter evenly between pans so both cakes bake to the same height. Level tops with a serrated knife if needed.
Cool completely: Let cakes fully cool before cutting or assembling to prevent crumbling.
Assemble in place: Build the heart shape directly on your serving tray to avoid moving the finished cake.
Frost generously: Use plenty of frosting to hide seams and define the heart shape. We used 2 full cans. No regrets.