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This Heart Surprise Cake recipe is perfect for Valentine's Day
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4.34 from 3 votes

Heart Inside Cake

This Heart Inside Cake is a fun dessert to make for Valentine's, Mother's Day or a birthday party. It's a hidden design where the heart is only revealed as a surprise when you cut the cake!
Prep Time20 mins
Cook Time20 mins
Freezing Time30 mins
Total Time1 hr 10 mins
Course: Dessert
Cuisine: American
Keyword: heart inside cake, hidden design cake
Servings: 12 servings
Calories: 372kcal
Author: Cindy


  • 15 oz red velvet cake mix 1 box, plus ingredients called for on the box
  • 15 oz white cake mix 1 box, plus ingredients called for on the box
  • 1 tube white icing
  • sprinkles optional


  • Preheat the oven at 350°F. Grease a loaf pan with butter and line with parchment paper.
  • Make the red velvet cake batter according to the package directions. Pour the batter into the prepared pan. Bake for 20-25 minutes or until a toothpick or cake tester comes out clean.
  • Remove the cake from oven and allow to cool in the pan for 5 minutes before unmolding onto a wire rack to cool completely.
  • Cut the cake widthwise into 1-inch thick slabs. Place the slab on a work surface and use a 2-inch heart-shaped cookie cutter to make heart-shaped cutouts (see note). Place them in a resealable plastic bag and freeze for 30 minutes.
  • Meanwhile, prepare the white cake batter according to the package directions. Clean and dry the loaf pan, greasing it and lining with parchment again.
  • Pour a 1/2 inch layer of white cake batter into the bottom of the pan. Carefully stack the hearts upright in the pan side-to-side so they are touching. Then pour the remaining batter on top just to cover completely (you may find it helpful to have a second set of hands to pour while you hold the hearts while you're doing this).
  • Bake 20-25 minutes or until a toothpick or cake tester comes out clean. Cool completely in the pan without unmolding.
  • When completely cool, use a spatula to spread the frosting evenly across the top and sides of the cake. Add sprinkles and serve.



  • Heart Shaped Cutter: If you don't have a heart-shaped cookie cutter, you can use a medium-sized soda bottle to make one. Watch the video to see how to do it.
  • Cake Mix: You can substitute any two cake mixes, as long as there is a color contrast. However, avoid sponge cakes or angel food cakes, which are difficult to work with.


Calories: 372kcal | Carbohydrates: 70g | Protein: 3g | Fat: 10g | Saturated Fat: 2g | Polyunsaturated Fat: 3g | Monounsaturated Fat: 3g | Sodium: 490mg | Potassium: 105mg | Fiber: 1g | Sugar: 49g | Vitamin A: 150IU | Calcium: 80mg | Iron: 1.6mg