Galaxy Graduation Cake Stars (Printable Version)

Celestial buttercream design with shimmering edible stars, ideal for memorable graduation moments.

# What You'll Need:

→ Cake

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

→ Galaxy Buttercream

09 - 1½ cups unsalted butter, softened
10 - 5 cups powdered sugar, sifted
11 - ¼ cup whole milk
12 - 2 teaspoons vanilla extract
13 - Black gel food coloring
14 - Navy blue gel food coloring
15 - Purple gel food coloring
16 - Pink gel food coloring
17 - Teal gel food coloring

→ Decoration

18 - Edible gold star sprinkles
19 - Edible silver star sprinkles
20 - Edible glitter or luster dust
21 - White gel food coloring

# How To Make It:

01 - Preheat oven to 350°F. Grease and line three 8-inch round cake pans with parchment paper.
02 - In a large bowl, cream together butter and sugar until light and fluffy. Add eggs one at a time, beating well after each addition. Mix in vanilla extract.
03 - In a separate bowl, whisk together flour, baking powder, and salt.
04 - Add dry ingredients to wet mixture in three parts, alternating with milk, beginning and ending with flour. Mix until just combined.
05 - Divide batter evenly among prepared pans. Bake for 30 to 35 minutes or until a toothpick inserted in the center comes out clean.
06 - Cool cakes in pans for 10 minutes, then transfer to wire racks to cool completely.
07 - Beat butter until creamy. Gradually add powdered sugar, then milk and vanilla. Beat until fluffy.
08 - Divide buttercream into four or five bowls. Tint each with a different galaxy color using gel food coloring in black, navy blue, purple, pink, and teal.
09 - Place random spoonfuls of each color onto a large piece of plastic wrap. Roll up to form a log. Snip one end and transfer the log to a piping bag fitted with a large round tip.
10 - Place one cake layer on a serving plate. Spread a thin layer of galaxy buttercream. Repeat with remaining layers.
11 - Apply a generous crumb coat all over the cake. Chill for 20 minutes.
12 - Pipe and spread galaxy buttercream over the cake, swirling gently with an offset spatula to create a marbled galaxy effect.
13 - Use white gel food coloring and a food-safe paintbrush or splatter tool to flick on stars across the cake surface.
14 - Decorate with edible gold and silver star sprinkles and a sprinkle of edible glitter or luster dust.
15 - Add a graduation cap cake topper for a festive touch if desired.

# Expert Advice:

01 -
  • The buttercream technique is forgiving enough that imperfect swirls look intentionally artistic—your happy accidents become the galaxy.
  • It's a showstopper that tastes like a classic vanilla cake, so you're not sacrificing flavor for drama.
  • Decorating feels like painting rather than baking, which somehow makes the whole process less stressful and way more fun.
02 -
  • Room temperature ingredients are absolutely essential—they incorporate smoothly and create a better crumb; I learned this the hard way when my first attempt came out dense and sad.
  • Don't mix the batter aggressively after adding dry ingredients, or you'll develop the gluten and end up with a tough cake instead of a tender one.
  • The piping log technique only works if your buttercream is the right consistency—too soft and the colors blend into mud, too stiff and it won't pipe smoothly.
  • Chill that crumb coat; it's the difference between a polished final coat and crumbs getting dragged through your pretty frosting.
03 -
  • Make sure your butter is truly softened—if you're unsure, leave it at room temperature for 30 minutes rather than microwaving it, which creates uneven texture.
  • The piping log stays fresh in the fridge for up to 4 hours, so you can prep it the morning before frosting day without stress.
  • If your galaxy buttercream colors start to muddy together, you're overworking it—a few gentle swirls create way more drama than aggressive blending.
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