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Perfect Gemini Constellation Cake Recipe Easy Stunning Galaxy Fondant Tutorial

Gemini Constellation Cake - featured image

A stunning galaxy-themed cake honoring the Gemini constellation, featuring moist layers, creamy buttercream filling, and a marbled galaxy fondant finish with edible shimmer and constellation details.

Ingredients

Scale
  • 2 ½ cups all-purpose flour (about 312g), sifted
  • 2 ½ tsp baking powder
  • ½ tsp baking soda
  • ½ tsp salt
  • 1 cup unsalted butter, softened (227g)
  • 1 ¾ cups granulated sugar (350g)
  • 4 large eggs, room temperature
  • 1 tbsp pure vanilla extract
  • 1 cup whole milk (240 ml)
  • 2 tbsp cocoa powder (unsweetened)
  • 1 cup unsalted butter, softened (227g) for buttercream
  • 4 cups powdered sugar (480g), sifted
  • 2 tsp vanilla extract for buttercream
  • 23 tbsp heavy cream or milk for buttercream
  • Pinch of salt for buttercream
  • 4 cups pre-made white fondant (about 900g)
  • Gel food coloring in navy blue, purple, black, and magenta
  • Edible shimmer dust or luster dust in silver and pearl
  • Edible white food coloring pen or white gel for constellation details
  • Small star-shaped sprinkles (optional)

Instructions

  1. Preheat oven to 350°F (175°C). Grease two 8-inch round cake pans and line bottoms with parchment paper. (10 minutes prep)
  2. Sift together flour, baking powder, baking soda, salt, and cocoa powder in a medium bowl. (5 minutes)
  3. Beat softened butter and granulated sugar in a large bowl until pale and fluffy, about 4-5 minutes on medium speed. (5 minutes)
  4. Beat in eggs one at a time, mixing well after each addition. Add vanilla extract. Batter may look curdled; this is normal. (3 minutes)
  5. With mixer on low, alternately add half the dry ingredients and half the milk, then the remaining dry ingredients and milk. Mix just until combined. (4 minutes)
  6. Divide batter evenly into prepared pans. Smooth tops with offset spatula. Bake 28-32 minutes or until toothpick inserted comes out clean. Rotate pans halfway through. (30 minutes)
  7. Cool cakes in pans for 10 minutes, then turn out onto wire racks to cool completely. (At least 1 hour)
  8. Make buttercream: Beat softened butter until creamy. Gradually add powdered sugar, then vanilla, salt, and cream. Beat on high for 5-6 minutes until fluffy and spreadable. (10 minutes)
  9. Level cake tops if needed. Place one layer on cake board or plate, spread thick layer of buttercream, top with second layer. Apply thin crumb coat over whole cake and chill for 20 minutes. (20 minutes)
  10. Divide fondant into portions and tint with gel colors using gloves. Roll and gently fold colors together to create marbled galaxy effect. Roll out to about 1/8 inch (3 mm) thickness on clean mat. (20 minutes)
  11. Carefully lift fondant over cake, smoothing with fondant smoother to avoid air bubbles. Trim excess at base. (10 minutes)
  12. Lightly brush edible shimmer dust for cosmic glow. Use white edible pen or gel to paint Gemini constellation, connecting stars with thin lines. Add star sprinkles if desired. (15 minutes)
  13. Chill cake for 30 minutes to set before serving.

Notes

Use Satin Ice fondant for smooth rolling and better taste. For dairy-free, substitute butter and milk with plant-based alternatives and use vegan fondant. Avoid rolling fondant too thin (about 1/8 inch). Keep workspace clean and dry. Use gel colors sparingly to avoid sticky fondant. Crumb coat well to prevent bumps. Allow cake layers to cool completely before fondant application. Fondant cracks can be smoothed with warm hands or patched. Practice constellation drawing lightly before using edible pens. Cake tastes better after resting overnight. Store covered in refrigerator up to 4 days; avoid freezing.

Nutrition

Keywords: Gemini cake, galaxy cake, constellation cake, fondant cake, birthday cake, astrology cake, buttercream, galaxy fondant, star cake