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Lemon Blueberry Sheet Cake

Lemon blueberry sheet cake with moist crumb and creamy lemon glaze

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A sunny, tender sheet cake bursting with bright lemon flavor and juicy blueberries. The key to its ultra-moist crumb is gently folding flour-coated berries into the batter at the last moment, preventing sinking and ensuring a perfect texture. This simple, crowd-pleasing dessert is ideal for potlucks and gatherings.

Ingredients

Scale
  • 2 1/2 cups all-purpose flour
  • 2 teaspoons baking powder
  • 1/2 teaspoon baking soda
  • 1/2 teaspoon salt
  • 3/4 cup unsalted butter, softened
  • 1 1/2 cups granulated sugar
  • 3 large eggs, room temperature
  • 1 tablespoon pure vanilla extract
  • 1 cup buttermilk, room temperature
  • Zest of 2 large lemons
  • 1/4 cup fresh lemon juice
  • 1 1/2 cups fresh blueberries
  • 1 tablespoon all-purpose flour (for tossing berries)
  • 1 1/2 cups powdered sugar, sifted (for glaze)
  • 2-3 tablespoons fresh lemon juice (for glaze)
  • 1 tablespoon whole milk or cream (for glaze)
  • Pinch of salt (for glaze)

Instructions

  1. Preheat oven to 350°F (175°C). Grease a 9×13-inch baking pan and line with parchment paper, leaving an overhang on the sides.
  2. In a medium bowl, whisk together 2 1/2 cups flour, baking powder, baking soda, and salt. In a small bowl, toss blueberries with 1 tablespoon flour until coated.
  3. In a large bowl, beat softened butter and granulated sugar on medium-high speed for 2-3 minutes until light and fluffy.
  4. Beat in eggs one at a time, then mix in vanilla, lemon zest, and 1/4 cup lemon juice.
  5. With mixer on low, add dry ingredients in three parts, alternating with buttermilk in two parts, beginning and ending with dry ingredients. Mix just until combined.
  6. Gently fold the flour-coated blueberries into the batter with a spatula.
  7. Pour batter into prepared pan and spread evenly. Bake for 30-35 minutes, until golden and a toothpick inserted in the center comes out clean.
  8. Cool cake in pan on a wire rack for at least 1 hour.
  9. For the glaze, whisk powdered sugar, 2 tablespoons lemon juice, milk, and a pinch of salt until smooth. Add more lemon juice if a thinner glaze is desired.
  10. Drizzle glaze over the completely cooled cake. Slice and serve.

Notes

For best results, use room temperature ingredients. Do not overmix the batter after adding flour. Coating blueberries in flour prevents sinking. Do not glaze the cake while warm. Frozen blueberries can be used without thawing; toss directly from the freezer in flour.

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