Spring Birthday Sheet Cake (Printer-friendly)

Tender vanilla crumb with lemon curd filling and fluffy whipped cream frosting for festive spring gatherings.

# What You'll Need:

→ Cake

01 - 2½ cups all-purpose flour
02 - 2½ teaspoons baking powder
03 - ½ teaspoon baking soda
04 - ½ teaspoon salt
05 - 1 cup unsalted butter, softened
06 - 2 cups granulated sugar
07 - 4 large eggs, room temperature
08 - 1 tablespoon vanilla extract
09 - 1 cup whole milk, room temperature
10 - Zest of 1 lemon

→ Lemon Curd Filling

11 - 4 large egg yolks
12 - ½ cup granulated sugar
13 - ⅓ cup fresh lemon juice
14 - Zest of 2 lemons
15 - ¼ cup unsalted butter, cubed

→ Whipped Cream Frosting

16 - 2 cups heavy cream, chilled
17 - ½ cup powdered sugar
18 - 1 teaspoon vanilla extract

→ Decoration

19 - Fresh berries such as strawberries, raspberries, and blueberries
20 - Edible flowers or lemon zest curls

# How-To Steps:

01 - Preheat oven to 350°F. Grease and line a 9x13-inch sheet pan with parchment paper.
02 - In a medium bowl, whisk together flour, baking powder, baking soda, and salt. Set aside.
03 - In a large bowl, cream softened butter and granulated sugar with an electric mixer until pale and fluffy, approximately 3-4 minutes.
04 - Add eggs one at a time, beating well after each addition. Mix in vanilla extract and lemon zest until fully combined.
05 - Add the dry ingredient mixture to the wet mixture in three parts, alternating with the milk. Begin and end with the dry ingredients, mixing until just combined.
06 - Pour batter into the prepared pan and smooth the top. Bake for 28-32 minutes, or until a toothpick inserted in the center comes out clean. Cool completely in the pan on a cooling rack.
07 - In a small saucepan, whisk together egg yolks, sugar, lemon juice, and zest. Cook over medium-low heat, stirring constantly, for approximately 5-7 minutes until thickened. Remove from heat and whisk in cubed butter until smooth. Transfer to a bowl, cover surface with plastic wrap, and refrigerate until completely chilled.
08 - Whip chilled heavy cream, powdered sugar, and vanilla extract until stiff peaks form. Keep refrigerated until ready to use.
09 - Once cake is completely cool, carefully slice horizontally to create two layers. Remove the top layer and spread the chilled lemon curd evenly over the bottom layer. Replace the top layer.
10 - Spread whipped cream frosting evenly over the assembled cake. Decorate with fresh berries, edible flowers, or lemon zest curls as desired.
11 - Refrigerate the assembled cake for at least 1 hour before serving to ensure clean slices.

# Expert Tips:

01 -
  • Perfect balance of sweet vanilla cake and tangy lemon curd for a refreshing flavor profile
  • Sheet cake format makes it easier to bake and serve than traditional layer cakes
  • Light whipped cream frosting that won't weigh you down
  • Beautiful presentation with fresh berries and edible flowers
  • Make-ahead friendly with components that can be prepared separately
  • Feeds a crowd with 12 generous servings
02 -
  • Use fresh lemon juice for the curd—bottled juice won't deliver the same bright, vibrant flavor
  • Don't skip the plastic wrap directly on the curd surface; it prevents a skin from forming
  • Chill your mixing bowl and beaters before whipping cream for the fluffiest results
  • A serrated knife and chilled cake make slicing horizontally much easier
  • Assemble the cake a few hours ahead and refrigerate to let flavors meld beautifully
  • Save some lemon zest for garnish—it adds a pop of color and aromatic freshness
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