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Perfect Sheet Cake Recipe with Easy School Colors Buttercream Frosting

Perfect Sheet Cake with School Colors Buttercream Frosting - featured image
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A moist, tender sheet cake topped with vibrant, smooth buttercream frosting in school colors. Perfect for celebrations, potlucks, and game day events.

Ingredients

Scale
  • 2 ½ cups (310 g) all-purpose flour, sifted
  • 2 cups (400 g) granulated sugar
  • 2 ½ teaspoons baking powder
  • ½ teaspoon baking soda
  • ½ teaspoon salt
  • ½ cup (113 g) unsalted butter, softened
  • 3 large eggs, room temperature
  • 1 cup (240 ml) buttermilk (or milk + 1 tbsp vinegar)
  • ½ cup (120 ml) sour cream
  • 2 teaspoons vanilla extract
  • 1 cup (227 g) unsalted butter, softened (for frosting)
  • 4 cups (480 g) powdered sugar, sifted
  • 1 teaspoon vanilla extract (for frosting)
  • 2–4 tablespoons milk or heavy cream (for frosting)
  • Gel food coloring in school colors

Instructions

  1. Preheat oven to 350°F (175°C). Grease a 9×13-inch baking pan with butter or non-stick spray and lightly dust with flour, tapping out excess.
  2. In a medium bowl, whisk together flour, baking powder, baking soda, and salt. Set aside.
  3. In a large bowl, beat ½ cup softened butter and granulated sugar on medium speed until pale and fluffy, about 3-4 minutes.
  4. Beat in eggs one at a time, mixing well after each addition. Stir in vanilla extract.
  5. Add dry ingredients to butter mixture in thirds, alternating with buttermilk and sour cream, beginning and ending with dry ingredients. Mix gently until just combined; avoid overmixing.
  6. Pour batter into prepared pan and smooth the top with a spatula. Bake 35-40 minutes or until a toothpick inserted in the center comes out clean and cake springs back lightly.
  7. Cool cake in pan on wire rack for 15 minutes, then remove from pan and cool completely before frosting.
  8. For frosting, beat 1 cup softened butter on medium speed until creamy, about 2 minutes. Gradually add powdered sugar on low speed to avoid sugar cloud.
  9. Add vanilla extract and 2 tablespoons milk or cream. Beat on high for 3-5 minutes until fluffy. Adjust consistency with more milk or sugar as needed.
  10. Divide frosting into separate bowls and add gel food coloring a little at a time to reach vibrant school colors.
  11. Use an offset spatula to frost the cooled cake in blocks or stripes matching school colors. Pipe borders or decorations if desired.

Notes

Use room temperature ingredients for best results. Avoid overmixing the batter to keep the cake light. Use gel food coloring for vibrant colors without affecting taste. If frosting becomes too soft while coloring, chill in fridge briefly before spreading. For gluten-free, substitute flour with gluten-free blend. For dairy-free, use coconut yogurt and plant-based milk alternatives.

Nutrition

Keywords: sheet cake, buttercream frosting, school colors, celebration cake, easy cake recipe, moist cake, colorful frosting

Find it online: https://junomeals.com/perfect-sheet-cake-recipe-with-easy-school-colors-buttercream-frosting/