Strawberry Sheet Cake

Total Time Prep Time: 15 mins. Cook Time: 15 mins. + cooling
Yield 24 slices
Test Kitchen Approved
This Texas-style strawberry sheet cake is made with a box of cake mix and strawberry gelatin. It's moist, tender and bursting with strawberry flavor.

Ingredients

  • CAKE:
  • 1 box (13-1/4 ounces) white cake mix
  • 1 package (3 ounces) strawberry gelatin
  • 3 tablespoons sugar
  • 3 tablespoons all-purpose flour
  • 1 cup water
  • 1/2 cup canola oil
  • 2 large eggs, room temperature, beaten
  • 1 cup finely chopped fresh strawberries
  • FROSTING:
  • 1/2 cup fresh strawberries
  • 1 cup butter, softened
  • 1 cup mascarpone cheese, room temperature
  • 1/4 teaspoon salt
  • 3-1/2 cups confectioners' sugar

Directions

  1. Preheat oven to 350°. Line the bottom of a 15x10x1-in. baking sheet with parchment paper; coat with cooking spray.
  2. In a large bowl, combine cake mix, gelatin, sugar and flour. Add water, oil and eggs; beat on low speed for 30 seconds; increase speed to medium and beat 2 minutes. Fold in chopped strawberries. Bake 15-16 minutes or until a toothpick inserted into the center comes out clean. Cool completely.
  3. Place strawberries in a food processor; pulse until smooth. Set aside.
  4. In the bowl of a stand mixer, beat butter and mascarpone until fluffy, 3-5 minutes. Beat in salt and strawberries. Gradually beat in confectioners' sugar until fluffy. Spread frosting over cooled cake.

Nutrition Facts

1 slice: 307 calories, 17g fat (8g saturated fat), 49mg cholesterol, 212mg sodium, 36g carbohydrate (29g sugars, 0 fiber), 2g protein.

This Texas-style sheet cake is made with a box of cake mix and strawberry gelatin. It's moist, tender and bursting with strawberry flavor. —Lauren Habermehl, Pewaukee, Wisconsin
Recipe Creator

© 2025 RDA Enthusiast Brands, LLC