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Birthday Cake

Birthday Cake with fluffy vanilla sponge and silky pink buttercream frosting with a swirl that holds in warm weather. Light sweetness with a hint of tang keeps each slice bright and celebratory.
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Prep Time 18 minutes
Cook Time 30 minutes
Total Time 48 minutes
Servings: 8 servings
Course: Dessert
Cuisine: American
Calories: 340
Ingredients Equipment Method Notes

Ingredients
  

Vanilla sponge layers
  • 2 large eggs Use room-temperature eggs for better volume.
  • 1 cup granulated sugar
  • 2 tsp baking powder
  • 0.5 tsp salt
  • 2 cups all-purpose flour
  • 1.5 cup whole milk
  • 0.5 cup unsalted butter Melt and cool slightly, or soften if your method uses creaming.
  • 2 tsp vanilla extract
  • 2 tbsp lemon juice Provides the subtle tang in the sponge.
Pink buttercream frosting
  • 1 lb powdered sugar
  • 0.5 lb unsalted butter Softened for easy mixing.
  • 2 tbsp heavy cream Add gradually to reach a thick, pipeable consistency.
  • 1 tsp vanilla extract
  • 1 tbsp lemon juice Tang to balance sweetness.
  • 2 tsp pink gel food coloring Start with less and add until the color looks right.
  • 0.5 tsp salt

Equipment

  • 1 stand mixer
  • 1 sheet pan

Method
 

Prep and bake the vanilla sponge
  1. Preheat oven to 350°F and line two 8-inch cake pans with parchment circles, then lightly grease the sides so the cakes release cleanly.
  2. In a mixing bowl, whisk eggs and sugar until pale and slightly thick, about 2-3 minutes, then whisk in vanilla and lemon juice until combined.
  3. Add flour, baking powder, and salt and mix just until no dry streaks remain.
  4. Stream in milk and melted butter, then mix on low until smooth, about 30-45 seconds, scraping the bowl once.
  5. Divide batter evenly between pans and bake until the centers spring back and a toothpick comes out clean, 25-35 minutes.
  6. Cool cakes in pans for 10 minutes, then turn out onto a rack to cool completely, about 1 hour, before frosting.
Make the pink buttercream and frost
  1. With a stand mixer, beat softened butter on medium until creamy, about 1-2 minutes, then add powdered sugar in batches on low.
  2. Add heavy cream, vanilla, lemon juice, salt, and pink gel food coloring, then mix on medium until silky and thick enough to hold a swirl, about 1-2 minutes.
  3. If frosting feels too stiff, beat in cream 1 tsp at a time; if too loose, add powdered sugar 1-2 tbsp at a time to reach pipeable consistency.
  4. Place one cooled cake layer on a serving plate and spread a layer of frosting over the top, then stack the second layer and apply a thin crumb coat.
  5. Chill the cake for 15 minutes so the crumb coat sets, then finish with a thicker swirl layer of frosting, keeping the pattern smooth.
  6. Slice and serve after frosting sets slightly, at room temperature, for cleaner swirl lines.

Notes

Pro tip: cool the sponge completely before frosting—warm layers melt buttercream and blur the swirl. Store covered in the fridge up to 4 days; for best texture, let it sit at room temperature 15 minutes before serving. Freeze unfrosted cake layers wrapped tightly for up to 2 months; thaw overnight in the fridge, then frost. For a lighter option, use low-fat milk in the sponge and reduce cream by 1 tbsp in the frosting while mixing to keep it pipeable.