Galaxy Graduation Cake Stars (Printable)

A stunning celestial cake with galaxy buttercream and edible star accents, ideal for special celebrations.

# 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 - Gel food coloring: black, navy blue, purple, pink, and teal

→ Decoration

14 - Edible gold and silver star sprinkles
15 - Edible glitter or luster dust
16 - White gel food coloring for stars and swirls

# 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 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 (black, navy blue, purple, pink, teal) using gel food coloring.
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 -
  • It looks like you spent hours perfecting it, but the technique is more forgiving than you'd think.
  • Every cake turns out beautifully unique because the galaxy effect is intentionally organic and unpredictable.
  • Guests always ask how you made it, and you get to share the satisfying secret of the buttercream log trick.
02 -
  • Room temperature ingredients are non-negotiable—cold butter won't cream properly, and cold eggs won't blend smoothly into the batter.
  • The buttercream log technique looks chaotic but is actually genius; those random colors swirled together are what create that authentic galaxy effect that no careful piping could replicate.
  • Don't skip the crumb coat chill step—it prevents crumbs from ruining your final frosting layer and makes the whole cake look polished.
03 -
  • Chill your cake layers before frosting if your kitchen is warm—cold cake won't shed crumbs and holds frosting edges more sharply.
  • The buttercream log can be made ahead and refrigerated for up to 3 days; just let it soften slightly before piping so it flows smoothly.
  • If your gel food coloring looks flat or muddy, you're probably using too much; start with a toothpick's worth and add more gradually.
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