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Creamy Flag Sheet Cake Recipe with Easy Vanilla Buttercream Frosting

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A moist and tender sheet cake with a smooth vanilla buttercream frosting, perfect for casual gatherings or quiet moments. This recipe is quick, easy, and uses simple pantry ingredients.

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
  • 1 cup (225 g) unsalted butter, softened
  • 4 large eggs, room temperature
  • 1 cup (240 ml) whole milk, room temperature
  • ½ cup (120 ml) sour cream
  • 2 teaspoons pure vanilla extract
  • For the Vanilla Buttercream Frosting:
  • 1 cup (225 g) unsalted butter, softened
  • 4 cups (480 g) powdered sugar, sifted
  • 2–4 tablespoons (30–60 ml) whole milk
  • 2 teaspoons pure vanilla extract
  • Pinch of salt

Instructions

  1. Preheat oven to 350°F (175°C). Grease a 9×13 inch pan and line with parchment paper.
  2. In a large bowl, sift together flour, baking powder, baking soda, and salt. Whisk to combine.
  3. Beat softened butter and granulated sugar on medium speed until light and fluffy, about 3-5 minutes.
  4. Add eggs one at a time, mixing well after each addition.
  5. In a separate bowl, mix milk, sour cream, and vanilla extract.
  6. With mixer on low, alternately add dry ingredients in three parts and wet mixture in two parts, starting and ending with dry ingredients. Mix just until combined.
  7. Pour batter into prepared pan and smooth the top.
  8. Bake for 35-40 minutes or until a toothpick inserted in the center comes out clean.
  9. Cool cake in pan for 15 minutes, then transfer to wire rack to cool completely.
  10. For frosting, beat softened butter until creamy. Gradually add powdered sugar, beating on low until combined.
  11. Add milk a tablespoon at a time until smooth and spreadable. Stir in vanilla and salt.
  12. Spread frosting evenly over cooled cake using an offset spatula or butter knife.

Notes

Use room temperature ingredients for best results. Do not overmix batter to avoid dense cake. Line pan with parchment paper for easy removal. Chill frosted cake briefly for a neat finish. Frosting can be loosened with extra milk if too stiff.

Nutrition

Keywords: sheet cake, vanilla buttercream, easy cake recipe, creamy cake, flag cake, simple dessert, party cake

Find it online: https://elvafood.com/creamy-flag-sheet-cake-recipe-with-easy-vanilla-buttercream-frosting/