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Sweetheart Cake

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Edited by Angela Ritchie
Updated Feb 3, 2026
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Bake your feelings known with a heart-shaped cake that's as sweet as it is easy. This easy Sweetheart Cake recipe is the ultimate romantic treat. Learn how to make a heart-shaped cake with a simple yet brilliant baking hack—no special heart-shaped pan required! Our step-by-step instructions and helpful diagram make this easy cake recipe perfect for bakers of all skill levels. Whether you're planning a romantic dinner or a fun Valentine's Day baking project, this homemade Sweetheart Cake is a foolproof way to share a little love.

Recipe Ingredients

Let's break down the delicious ingredients that make this Sweetheart Cake so special!

White Cake Mix: It's the ultimate shortcut for homemade taste without the fuss.

Water: Hydrates the dry ingredients, helping to form the batter.

Vegetable oil: Adds richness and contributes significantly to the moist texture of your cake, keeping it tender.

Egg Whites: Provide structure and lift, making your heart-shaped cake light and airy.

White Frosting: This ready-to-use frosting is perfect for a smooth and creamy cake topping.

Red Gel Food Color: Gel food coloring provides a vibrant, rich color without thinning out your frosting, making your romantic dessert visually stunning.

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How to Make Sweetheart Cake

To ensure your Sweetheart Cake turns out perfectly, here are some key tips. See the full recipe below for all the details.

1. Bake Cakes

If you're using dark or nonstick pans, preheat your oven to 325°F instead of 350°F. If you have a mix of pan types, bake both at 325°F, adding a few extra minutes to the baking time if needed. Cakes are done when a toothpick inserted into the center comes out clean.

2.Cool Cakes

This is crucial! Make sure your cakes are completely cool (about 1 hour) before you attempt to cut or frost them. Warm cakes will crumble and make frosting very difficult. You can also freeze the cooled cakes for about an hour before assembling and decorating.

3. Assemble Heart 

To create a professional-looking, level cake, use a serrated knife to carefully trim the tops of each cake so they are the same height. This ensures your heart shape sits nicely and looks even.

4. Frost and Enjoy 

Since it's gel food color, a little goes a long way, so it's best to add it gradually and mix well after each addition until you achieve the perfect hue for your Sweetheart Cake!

How to Store Sweetheart Cake

Room Temperature

You can store the cake at room temperature up to two days. Cover with a cake dome or insert several toothpicks into the top of the cake (to protect the frosting) and drape with plastic wrap.

Sweetheart Cake

  • Prep Time 25 min
  • Total 1 hr 50 min
  • Servings 12
  • Ingredients 4
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Ingredients

Diagram/Template Download

Instructions

  • Step 
    1

    Heat oven to 350°F (see Tips). Grease or lightly spray bottom and sides of one 8-inch round cake pan and one 8-inch square pan.

  • Step 
    2

    In large bowl, beat cake mix, water, oil, and egg whites with electric mixer on medium speed for 2 minutes, scraping bowl occasionally. Divide batter evenly between the pans.

  • Step 
    3

    Bake the square pan for 22 to 26 minutes and the round pan for 26 to 31 minutes or until toothpick inserted in center comes out clean. Cool 10 minutes; remove from the pans to a cooling rack. Cool completely, about 1 hour.

  • Step 
    4

    Using a serrated knife, cut the round cake in half to create two semicircles. (See link for diagram above.)

  • Step 
    5

    Place the square cake on a tray or serving platter with one corner pointing down toward you. Place the cut side of each semicircle against one of the top sides of square cake to make a heart. 

  • Step 
    6

    In a medium bowl, mix the frosting with a few drops of the red food color until blended. Add additional food color until desired shade of pink is reached. Frost cake with the frosting. Store loosely covered at room temperature.

Nutrition

Nutrition Facts are not available for this recipe

Recipe Tips

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