Blackberry Galaxy Gemini Mini Cake

The Blackberry Galaxy Gemini Mini Cake is an enchanting, zodiac-inspired dessert that blends artistry with rich flavor. Featuring layers of blackberry-infused sponge and tangy blackberry compote, this heart-shaped mini cake is frosted with deep black cocoa buttercream and topped with celestial galaxy dust and gold Gemini embellishments—ideal for astrology lovers and cosmic birthday celebrations.

Why You’ll Love This Recipe

This mini cake is a feast for both the palate and the eyes. The blackberry flavor is vibrant and fruity without being overly sweet, perfectly paired with the dramatic depth of black cocoa. Its compact heart shape makes it perfect for intimate gatherings, while the galaxy-themed decorations turn it into a showstopping centerpiece. It’s ideal for anyone looking to add a personalized, astrological touch to a birthday or celebration.

Ingredients

(Tip: You can find the complete list of ingredients and their measurements in the recipe card below.)

For the Blackberry Cake:

• all-purpose flour
• baking powder
• salt
• unsalted butter, softened
• granulated sugar
• large eggs
• vanilla extract
• whole milk
• blackberry puree (strained)

For the Blackberry Compote Filling:

• blackberries (fresh or frozen)
• sugar
• lemon juice
• cornstarch mixed with water

For the Black Cocoa Buttercream:

• unsalted butter, softened
• powdered sugar
• black cocoa powder
• vanilla extract
• milk or cream

For Decoration:

• edible galaxy glitter dust (blue, purple, black)
• white sugar pearls
• gold acrylic or fondant Gemini zodiac topper

Directions

Make the Cake:

1. Preheat oven to 350°F (175°C). Grease and line two 6-inch heart-shaped cake pans.
2. In a bowl, sift together flour, baking powder, and salt.
3. Cream butter and sugar until fluffy.
4. Beat in eggs one at a time, then mix in vanilla.
5. Alternate adding the dry ingredients and milk to the creamed mixture.
6. Stir in the blackberry puree until just combined.
7. Divide batter evenly between the pans and bake for 25–30 minutes, or until a toothpick comes out clean.
8. Cool cakes completely on a wire rack.

Make the Compote:

1. In a small saucepan, cook blackberries, sugar, and lemon juice over medium heat until bubbling.
2. Stir in cornstarch slurry and simmer until thickened.
3. Let cool completely before using.

Make the Buttercream:

1. Beat butter until creamy and smooth.
2. Gradually add powdered sugar and black cocoa powder.
3. Mix in vanilla and milk until frosting is smooth and spreadable.

Assemble the Cake:

1. Place one cake layer on a serving plate.
2. Spread blackberry compote over the top.
3. Add the second cake layer and cover the entire cake with black cocoa buttercream.
4. Use an offset spatula to smooth the top and pipe decorative swirls around the edges.

Decorate:

1. Lightly dust the top with edible galaxy glitter dust for a cosmic effect.
2. Add white sugar pearls to mimic stars.
3. Finish with a gold Gemini zodiac topper for an astrological touch.

Servings and timing

Prep Time: 40 minutes
Cooking Time: 30 minutes
Total Time: 1 hour 10 minutes
Servings: 8 slices
Calories: 420 kcal per slice

Variations

• Use raspberries or blueberries in place of blackberries for a different fruit flavor.
• Add a layer of lemon curd with the compote for a bright citrus contrast.
• Change the zodiac topper to suit any astrological sign.
• Bake in a round pan if a heart shape isn’t available.

storage/reheating

Store the cake in an airtight container in the refrigerator for up to 3 days. Let it come to room temperature before serving for best texture. The cake can also be frozen (without decoration) for up to 1 month. Thaw in the refrigerator overnight and decorate fresh before serving.

FAQs

Can I use blackberry jam instead of making compote?

Yes, a good-quality blackberry jam can be used as a shortcut, though the flavor may be slightly sweeter and less fresh.

What is black cocoa powder?

Black cocoa powder is a very dark, Dutch-processed cocoa that gives a deep color and mild chocolate flavor—perfect for dramatic frosting.

Can I use a different shape for the cake?

Yes, any 6-inch cake pan will work, though the heart shape adds a special touch.

How do I make blackberry puree?

Blend blackberries and strain through a sieve to remove seeds.

Can I make the cake layers in advance?

Yes, the cake layers can be baked a day ahead and stored wrapped at room temperature or in the refrigerator.

How do I achieve the galaxy look?

Lightly dust the buttercream with edible glitter in blue, purple, and black hues using a soft brush or fingertip.

Is this cake suitable for kids?

Yes, just ensure the decorations used are safe and non-toxic if inedible toppers are chosen.

Can I use cream cheese in the frosting?

Yes, replace half the butter with cream cheese for a tangier flavor.

Is this cake overly sweet?

No, the blackberry compote balances the sweetness of the frosting, creating a well-rounded flavor.

Can I double the recipe for a larger cake?

Yes, scale all ingredients evenly and adjust baking time for larger pans.

Conclusion

The Blackberry Galaxy Gemini Mini Cake is a magical, zodiac-themed dessert that captivates both in appearance and taste. With its rich blackberry layers, striking black cocoa buttercream, and celestial design, it’s the ultimate birthday cake for astrology fans or anyone who loves a touch of cosmic drama in their celebration.

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