Royal Flavors: Homemade Union Jack Cake Recipe

Discover the art of baking a stunning Union Jack cake. Our recipe guides you to create a patriotic masterpiece that’s as delicious as it is impressive.

How to make Union Jack icing?

Creating a Union Jack design with icing involves arranging the iconic red, white, and blue pattern of the United Kingdom’s flag. To achieve this on a cake, you’ll need piping bags, food coloring, and a steady hand. Here’s a basic guide on how to make Union Jack icing:

Materials Needed:

  • Cake covered in a neutral-colored icing (white or light-colored)
  • Red, blue, and white icing (royal icing or buttercream)
  • Piping bags
  • Piping tips (small round tips for outlines and larger tips for filling)
  • Toothpicks (for guidance)


  1. Prepare Your Icing: Color one portion of your icing red and another portion blue. Leave a third portion white. Make sure your icing is at the right consistency for piping, not too thin or too thick.
  2. Plan the Design: Before you start piping, it’s a good idea to have a clear plan of how you want the Union Jack to look on your cake. You might want to lightly sketch the design with a toothpick to provide some guidance.
  3. Outline the Cross: Using a small round piping tip and the blue icing, begin by piping a vertical line down the center of the cake and a horizontal line across the center, intersecting the vertical line. This forms the cross of St. Andrew.
  4. Add the Diagonal Crosses: Using the same blue icing and piping tip, pipe diagonal lines from the corners of the cross towards the edges of the cake. These diagonal lines will form the diagonal crosses of St. Patrick.
  5. Fill in the Blue Areas: Switch to a larger piping tip and use the blue icing to fill in the areas created by the blue lines. This will create a solid blue background for the diagonal crosses.
  6. Outline and Fill the Rest of the Design: Switch to the red icing and pipe an outline around the blue cross and diagonal crosses. Then, switch to white icing and pipe an outline around the entire flag. This will separate the blue and red portions of the flag.
  7. Add the Red and White Areas: Fill in the areas created by the red and white outlines with the respective icings. The central red cross of St. George should be red, and the white spaces should be filled with white icing.
  8. Finishing Touches: Once you’ve filled in all the areas, you can use a toothpick or a small spatula to smooth out any rough edges or uneven surfaces.
  9. Let it Set: Allow the icing to set and firm up before serving or transporting the cake.
Union Jack Cake Recipe

Best Union Jack Cake Recipe


For the Cake:

  • 2 ½ cups all-purpose flour
  • 2 ½ teaspoons baking powder
  • ½ teaspoon salt
  • 1 ¼ cups unsalted butter, softened
  • 2 cups granulated sugar
  • 4 large eggs
  • 1 teaspoon vanilla extract
  • 1 cup whole milk

For the Frosting:

  • 4 cups powdered sugar
  • 1 ½ cups unsalted butter, softened
  • 2 teaspoons vanilla extract
  • Food coloring (red, blue)

For Decoration:

  • Red and blue food-safe gel or paste colors
  • Piping bags and tips for fine lines
  • Union Jack template (printable)


Step 1: Baking the Cake Layers

  1. Preheat your oven to 350°F (175°C). Grease and flour three 8-inch round cake pans.
  2. In a medium bowl, whisk together the flour, baking powder, and salt. Set aside.
  3. In a large mixing bowl, cream the softened butter and granulated sugar until light and fluffy.
  4. Add eggs, one at a time, beating well after each addition. Stir in the vanilla extract.
  5. Gradually add the dry flour mixture to the wet ingredients, alternating with the milk. Mix until just combined.
  6. Divide the batter equally between the prepared pans. Smooth the tops with a spatula.
  7. Bake in the preheated oven for 25-30 minutes or until a toothpick inserted into the center comes out clean.
  8. Allow the cakes to cool in the pans for 10 minutes before transferring them to a wire rack to cool completely.

Step 2: Creating the Frosting Palette

  1. In a large bowl, beat the softened butter until creamy and smooth.
  2. Gradually add powdered sugar, one cup at a time, while continuing to beat.
  3. Mix in the vanilla extract to achieve a smooth and velvety frosting base.
  4. Divide the frosting into three parts. Use food coloring to tint one part red, another part blue, and leave the third part white.

Step 3: Assembling and Decorating the Union Jack Cake

  1. Place one cake layer on a cake stand or serving plate. Spread a layer of white frosting on top.
  2. Place the second cake layer on top. Spread a layer of blue frosting on this layer.
  3. Finally, place the third cake layer on top. Spread a layer of red frosting on this layer.
  4. Use a spatula to frost the sides of the cake with white frosting for a clean and polished look.

Step 4: Adding the Union Jack Design

  1. Find a printable Union Jack flag template online. Resize it to fit the size of your cake.
  2. Cut out the blue sections of the flag template and lay it gently on top of the cake.
  3. Use a fine piping tip and blue frosting to pipe the blue sections of the flag onto the cake.
  4. Carefully remove the template and repeat the process with the red sections of the flag using red frosting.


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Royal Flavors: Homemade Union Jack Cake Recipe
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