Spring Birthday Sheet Cake (Printer View)

Tender vanilla crumb with lemon curd filling and whipped cream frosting for spring celebrations.

# 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, or blueberries
20 - Edible flowers or lemon zest curls

# Method 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.
03 - In a large bowl, beat butter and sugar with an electric mixer until pale and fluffy, approximately 3-4 minutes.
04 - Add eggs one at a time to the butter mixture, beating well after each addition. Mix in vanilla extract and lemon zest.
05 - Add dry ingredients to wet mixture in three parts, alternating with milk. Begin and end with dry ingredients, mixing until just combined.
06 - Pour batter into prepared pan and smooth the top. Bake for 28-32 minutes until a toothpick inserted in the center comes out clean. Cool completely in the pan on a rack.
07 - While cake cools, combine egg yolks, sugar, lemon juice, and zest in a small saucepan. Cook over medium-low heat, stirring constantly, until thickened, about 5-7 minutes. Remove from heat and whisk in butter until smooth. Transfer to bowl, cover surface with plastic wrap, and refrigerate until cold.
08 - Whip chilled heavy cream, powdered sugar, and vanilla extract until stiff peaks form. Keep refrigerated until ready to assemble.
09 - Once cake is completely cooled, carefully slice it horizontally to create two even layers. Spread chilled lemon curd evenly over the bottom layer and replace the top layer.
10 - Spread whipped cream frosting evenly over the cake. Decorate with fresh berries, edible flowers, or lemon zest curls as desired.
11 - Refrigerate assembled cake for at least 1 hour before serving to ensure clean slices.

# Expert Advice:

01 -
  • The homemade lemon curd is pure tangy magic—once you taste it, store-bought versions feel one-dimensional by comparison.
  • Sheet cakes are forgiving and fast, which means you can make this on a whim without the stress of layer cakes.
  • Whipped cream frosting feels light and elegant but takes just minutes to whip together from ingredients most kitchens have on hand.
02 -
  • Room temperature ingredients truly matter here—cold eggs and milk won't blend smoothly into the butter, leaving you with a grainy, uneven crumb that bakes up dense.
  • When making lemon curd, don't rush the heat or skip the constant stirring, or you'll scramble the egg yolks and end up with a broken, curdled mess that tastes bitter and gritty.
03 -
  • Brush each cake layer with a simple lemon syrup (equal parts lemon juice and sugar, heated until the sugar dissolves) before adding the curd—this adds moisture and intensifies the lemon flavor without making anything soggy.
  • Keep your offset spatula in warm water between strokes when frosting; the warmth helps the knife glide through the whipped cream smoothly without dragging or tearing.
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