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Lemon Blueberry Sheet Cake

Lemon blueberry sheet cake slice with glaze and fresh berries on plate

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This simple sheet cake is a burst of summer flavor, combining bright lemon and sweet blueberries in a tender, easy-to-make dessert. Perfect for any occasion, it’s a guaranteed crowd-pleaser that comes together quickly.

Ingredients

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  • 2 1/2 cups all-purpose flour
  • 1 1/2 cups granulated sugar
  • 1 teaspoon baking powder
  • 1/2 teaspoon baking soda
  • 1/2 teaspoon salt
  • 1 cup buttermilk, room temperature
  • 1/2 cup unsalted butter, melted and cooled
  • 1/2 cup vegetable oil
  • 3 large eggs, room temperature
  • 2 tablespoons fresh lemon zest
  • 1/4 cup fresh lemon juice
  • 1 teaspoon pure vanilla extract
  • 1 1/2 cups fresh blueberries
  • 1 1/2 cups powdered sugar, sifted
  • 2-3 tablespoons fresh lemon juice
  • 1 tablespoon whole milk or cream
  • 1 pinch salt

Instructions

  1. Preheat oven to 350°F (175°C). Grease a 9×13 inch baking pan and line with parchment paper.
  2. In a large bowl, whisk together flour, sugar, baking powder, baking soda, and salt.
  3. In a separate bowl, whisk buttermilk, melted butter, oil, eggs, lemon zest, lemon juice, and vanilla until smooth.
  4. Pour wet ingredients into dry ingredients. Gently fold together until just combined.
  5. Gently fold in fresh blueberries.
  6. Pour batter into prepared pan and spread evenly. Bake for 35-40 minutes, until golden and a toothpick inserted comes out clean.
  7. Cool cake in pan on a wire rack for at least 30 minutes.
  8. For the glaze, whisk powdered sugar, 2 tablespoons lemon juice, milk, and a pinch of salt until smooth. Add more lemon juice if needed.
  9. Drizzle glaze over cooled cake. Garnish with extra blueberries if desired.

Notes

For frozen blueberries, do not thaw; toss in 1 tbsp flour from the measured amount before folding in. Buttermilk can be substituted by adding 1 tbsp lemon juice to 1 cup milk and letting it sit for 5 minutes. Do not overmix the batter. Ensure cake is completely cool before glazing.

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