Secret Ingredient Chocolate Cake

Secret Ingredient Chocolate Cake
Want to know that the secret ingredient is to get the richest chocolate cake you’ve ever had? It’s all in the mayonnaise. Adding mayo to your batter helps keep the cake tender and retain moisture while highlighting the chocolate flavor. Say “no, thank you” to dry cake for good!
  • Serves: 10–12
  • Prep Time: 15 minutes
  • Cook Time: 35 minutes


  • Cake
  • 2 cups all-purpose flour
  • 1 cup granulated sugar
  • ¼ cup unsweetened cocoa powder
  • 2 teaspoons baking soda
  • 1 cup water
  • 1 cup mayonnaise
  • 1 teaspoon vanilla extract
  • 1 tablespoon brewed coffee, black
  • 2 tablespoons French vanilla coffee creamer
  • Frosting
  • ½ cup packed light brown sugar
  • 4 tablespoons (½ stick) unsalted butter
  • 2 tablespoons French vanilla coffee creamer
  • 2 cups loosely packed confectioners’ sugar
  • Chocolate chips for serving


  1. For the cake: Preheat the oven to 350°F. Coat an 8 x 8-inch baking dish with cooking spray.
  2. In a large bowl, mix together the flour, granulated sugar, cocoa powder, and baking soda.
  3. In a separate bowl, whisk together the water, mayonnaise, vanilla, and coffee.
  4. Slowly add the coffee mixture to the flour mixture. Stir just until combined and pour into the prepared baking
  5. Bake for 30 to 35 minutes, until a toothpick inserted into the center comes out clean.
  6. For the frosting: In a medium saucepan, combine the brown sugar and butter and cook over medium heat until bubbling, about 5 minutes. Be sure to whisk continuously, so it doesn’t burn.
  7. Take off the heat and stir in the creamer. Then gradually add the confectioners’ sugar and whisk until smooth.
  8. Frost the cake, cut into slices, and serve, garnished with chocolate chips.
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