Happy Birthday Cake Slice

Featured in: Snack Fun

This moist vanilla sponge is layered with smooth, creamy buttercream frosting and decorated with colorful sprinkles for a festive look. The batter combines all-purpose flour, sugar, butter, eggs, milk, baking powder, salt, and pure vanilla extract for a tender crumb. The frosting mixes butter, powdered sugar, milk, vanilla, and a pinch of salt to create a light, fluffy texture. Baked in an 8-inch pan, it cools completely before being sliced and layered. The finishing touch of sprinkles brings a joyful, celebratory vibe to each slice, perfect for special occasions.

Updated on Thu, 04 Dec 2025 16:54:00 GMT
A delicious slice of Happy Birthday Cake, layered with creamy frosting and vibrant sprinkles, ready to serve. Save
A delicious slice of Happy Birthday Cake, layered with creamy frosting and vibrant sprinkles, ready to serve. | grinnosh.com

A festive, moist vanilla sponge cake layered with creamy buttercream and topped with colorful sprinkles—a joyful treat perfect for any celebration.

This cake always brings smiles to our family gatherings and makes every birthday feel extra special.

Ingredients

  • 1 2/3 cups (210 g) all-purpose flour: For the sponge cake
  • 1 cup (200 g) granulated sugar: For the sponge cake
  • 1/2 cup (115 g) unsalted butter, softened: For the sponge cake
  • 3 large eggs, at room temperature: For the sponge cake
  • 1/2 cup (120 ml) whole milk: For the sponge cake
  • 2 tsp baking powder: For the sponge cake
  • 1/2 tsp salt: For the sponge cake
  • 1 tbsp pure vanilla extract: For the sponge cake
  • 1 cup (225 g) unsalted butter, softened: For the buttercream frosting
  • 3 cups (360 g) powdered sugar, sifted: For the buttercream frosting
  • 2 tbsp whole milk: For the buttercream frosting
  • 1 tsp pure vanilla extract: For the buttercream frosting
  • Pinch of salt: For the buttercream frosting
  • 1/4 cup (40 g) colorful sprinkles: For decoration

Instructions

Preheat the oven:
Preheat the oven to 350°F (175°C). Grease and line an 8-inch (20 cm) round cake pan with parchment paper.
Cream the butter and sugar:
In a large bowl, cream together the butter and sugar until light and fluffy, about 3 minutes.
Mix in eggs and vanilla:
Beat in the eggs, one at a time, mixing well after each addition. Stir in the vanilla extract.
Combine dry ingredients:
In a separate bowl, whisk together the flour, baking powder, and salt.
Mix batter:
Add the dry ingredients to the wet mixture in three parts, alternating with the milk, beginning and ending with the flour. Mix until just combined.
Pour and smooth batter:
Pour the batter into the prepared cake pan and smooth the top.
Bake the cake:
Bake for 28-32 minutes, or until a toothpick inserted in the center comes out clean.
Cool the cake:
Let the cake cool in the pan for 10 minutes, then turn out onto a wire rack to cool completely.
Prepare frosting:
For the frosting, beat the butter until creamy. Gradually add powdered sugar, milk, vanilla, and salt, beating until smooth and fluffy.
Assemble the cake:
Once the cake is completely cool, slice it horizontally to create two layers. Spread frosting between the layers and over the top and sides.
Decorate and serve:
Decorate with colorful sprinkles. Slice and serve.
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Every slice brings back warm memories of family birthdays and celebrations filled with laughter.

Notes

Pairs well with sparkling wine or fresh lemonade.

Required Tools

8-inch (20 cm) round cake pan, electric mixer, mixing bowls, rubber spatula, wire rack, serrated knife

Allergen Information

Contains eggs, milk, wheat (gluten), and dairy. Check all packaged decorations for potential allergens.

Moist Happy Birthday Cake slice, a vanilla marvel, boasts buttercream frosting and a cascade of rainbow sprinkles. Save
Moist Happy Birthday Cake slice, a vanilla marvel, boasts buttercream frosting and a cascade of rainbow sprinkles. | grinnosh.com

Enjoy this cake fresh for best taste and texture.

Recipe FAQ

What makes the sponge cake moist?

The combination of whole milk, butter, and eggs helps create a tender and moist crumb in the vanilla sponge.

Can I add a chocolate flavor to this cake?

Yes, you can replace 1/3 cup of the flour with unsweetened cocoa powder to add a chocolate twist.

How should the buttercream frosting be prepared?

Beat softened butter until creamy, then gradually add powdered sugar, milk, vanilla, and a pinch of salt, mixing until smooth and fluffy.

What is the best way to layer the cake?

After cooling, slice the cake horizontally into two layers, spread frosting between them, then cover the top and sides before decorating.

How do colorful sprinkles enhance the cake?

Sprinkles add a playful, festive touch and vibrant color, making each slice visually appealing and joyful.

What tools are recommended for baking this cake?

An 8-inch round pan, electric mixer, mixing bowls, rubber spatula, wire rack, and serrated knife are ideal for preparation.

Happy Birthday Cake Slice

Festive vanilla sponge layered with buttercream and topped with colorful sprinkles for any celebration.

Prep duration
25 min
Cook duration
30 min
Complete duration
55 min
Created by Hannah Lewis

Type Snack Fun

Skill level Medium

Heritage International

Output 8 Portions

Dietary guidelines Meat-free

Components

Sponge Cake

01 1 2/3 cups all-purpose flour (7.4 oz)
02 1 cup granulated sugar (7 oz)
03 1/2 cup unsalted butter, softened (4 oz)
04 3 large eggs, at room temperature
05 1/2 cup whole milk (4 fl oz)
06 2 teaspoons baking powder
07 1/2 teaspoon salt
08 1 tablespoon pure vanilla extract

Buttercream Frosting

01 1 cup unsalted butter, softened (8 oz)
02 3 cups powdered sugar, sifted (12.7 oz)
03 2 tablespoons whole milk (1 fl oz)
04 1 teaspoon pure vanilla extract
05 Pinch of salt

Decoration

01 1/4 cup colorful sprinkles (1.4 oz)

Directions

Stage 01

Prepare oven and pan: Preheat oven to 350°F. Grease and line an 8-inch round cake pan with parchment paper.

Stage 02

Cream butter and sugar: In a large bowl, beat the butter and sugar until light and fluffy, approximately 3 minutes.

Stage 03

Incorporate eggs and vanilla: Add eggs one at a time, mixing well after each addition. Stir in vanilla extract.

Stage 04

Combine dry ingredients: Whisk together flour, baking powder, and salt in a separate bowl.

Stage 05

Mix batter: Alternate adding dry ingredients and milk to the wet mixture in three parts, beginning and ending with dry ingredients; mix until just combined.

Stage 06

Transfer batter and bake: Pour batter into prepared pan and smooth the surface. Bake for 28 to 32 minutes or until a toothpick inserted in the center emerges clean.

Stage 07

Cool cake: Allow cake to cool in the pan for 10 minutes, then transfer to a wire rack to cool completely.

Stage 08

Prepare frosting: Beat butter until creamy. Gradually add powdered sugar, milk, vanilla extract, and salt, continuing to beat until smooth and fluffy.

Stage 09

Assemble cake: Once cooled, slice cake horizontally into two layers. Spread frosting between layers, then cover top and sides evenly.

Stage 10

Decorate and serve: Garnish with colorful sprinkles. Slice and serve.

Necessary tools

  • 8-inch round cake pan
  • Electric mixer
  • Mixing bowls
  • Rubber spatula
  • Wire rack
  • Serrated knife

Allergy details

Review each component for potential allergens and consult with healthcare professionals if you're uncertain about ingredients.
  • Contains eggs, milk, wheat (gluten), and dairy.
  • Check packaged decorations for potential allergens.

Nutrient content (per portion)

These values are approximate guidelines only and shouldn't replace professional nutritional advice.
  • Energy: 430
  • Fats: 21 g
  • Carbohydrates: 57 g
  • Proteins: 4 g