Pisces Birthday Ocean Galaxy (Printable Version)

Vanilla cake with swirled ocean galaxy buttercream and shimmering edible glitter for a celestial touch.

# What You'll Need:

→ Cake

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

→ Ocean Galaxy Buttercream

09 - 1 1/2 cups unsalted butter, softened
10 - 6 cups powdered sugar, sifted
11 - 1/4 cup whole milk
12 - 2 teaspoons vanilla extract
13 - Gel food coloring: navy blue, teal, purple, turquoise, white
14 - Edible glitter or white sprinkles for decoration

# Steps:

01 - Preheat oven to 350°F. Grease and line two 8-inch round cake pans with parchment paper.
02 - In a medium bowl, whisk together flour, baking powder, and salt.
03 - In a large bowl, beat softened butter and sugar with an electric mixer until light and fluffy, approximately 3-4 minutes.
04 - Add eggs one at a time, mixing well after each addition. Mix in vanilla extract.
05 - Alternately add the dry ingredient mixture and milk to the butter mixture, starting and ending with flour. Mix until just combined.
06 - Divide batter evenly between prepared pans. Smooth tops and bake for 28-32 minutes, or until a toothpick inserted in the center comes out clean.
07 - Cool cakes in pans for 10 minutes, then turn out onto wire racks to cool completely.
08 - Beat softened butter until creamy. Gradually add powdered sugar, beating well. Add vanilla and milk; beat until smooth and fluffy for approximately 3-4 minutes.
09 - Divide buttercream into 4 or 5 separate bowls. Tint each portion with gel food coloring to create navy, teal, purple, turquoise shades, and leave one portion white.
10 - Place random dollops of each colored buttercream onto the cake. Use an offset spatula to swirl colors together for a marbled galaxy effect.
11 - Decorate the frosted cake with edible glitter or white sprinkles to create a starry appearance.
12 - Refrigerate the assembled cake for at least 30 minutes before slicing to ensure clean cake layers.

# Expert Advice:

01 -
  • It looks restaurant-worthy but tastes like genuine homemade cake, which is the ultimate compliment.
  • The galaxy effect means no two cakes look the same, so even if you wobble with the spatula, it adds to the magic.
  • Vanilla cake is the perfect canvas for the real star here—that dreamy, color-shifting buttercream.
02 -
  • Room-temperature eggs and milk aren't just preferences—they actually emulsify into the batter properly, while cold ones can cause the mixture to look curdled and separated, which leads to a dense crumb.
  • Gel food coloring is not the same as liquid; liquid coloring thins the buttercream and can make it weepy, while gel keeps it thick and beautiful without compromising texture.
03 -
  • If you want to make this cake a day ahead, wrap the unfrosted layers tightly in plastic wrap and store them at room temperature (or in the fridge if your kitchen is very warm), then frost the next day—the cakes actually stay moister this way and frosting fresh is easier.
  • The edible glitter sticks better if the buttercream is still slightly soft when you apply it, so sprinkle right after frosting rather than waiting until everything is chilled.
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