This festive Rainbow Cake is an impressive birthday party cake, made from a deceptively easy recipe. Even if you are a cake-decorating novice, you can handle this simple cake recipe. This is perfect for a St. Paddy's Day celebration (just don't expect to find a leprechaun at the end) or great for a spring party or a birthday party.
- 1 box cake mix and accompanying ingredients needed to make cake
- Bundt cake pan
- 5 cups white decorator icing
- red food colouring
- orange food colouring
- yellow food colouring
- green food colouring
- blue food colouring
- violet food colouring
- Wilton 1M tip (or another large star tip)
- pastry bags
- 10 inch round cake board (or cardboard)
- decorative foil wrap
- serrated knife
Step 1: Make the cake batter according to package directions, and bake the cake in the Bundt pan according to the package directions.
Step 2: Turn the cake out onto a cooling rack to cool completely.
Step 3: While the cake is cooling colour your icing like so:
- colour 2 cups of icing red using the red food colouring
- colour 1 cup of icing violet using the violet food colouring
- colour ½ cup of decorator icing orange using the orange food colouring
- colour ½ cup of decorator icing yellow using yellow food colouring
- colour ½ cup of decorator icing green using green food colouring
- colour ½ cup of decorator icing blue using blue food colouring
Step 4: Cover a 10 inch round cake board with decorative foil.
Step 5: Level the top of the cake with a serrated knife so it's flat.
Step 6: Cut the cake in half so you have a half moon for the rainbow.
Step 7: Put a little icing on the cake board in a half moon shape, where you’re placing the cake; this will act as a glue to keep the cake in place. Place the cake on the cakeboard over the icing, cut-side down.
Step 8: With a spatula, ice the back of the cake (the outside of the rainbow) up to the top, with red icing to seal up any cracks at the base of the cake.
Step 9: With a spatula ice the front of the cake (inside or the rainbow) with violet icing about half way up the side, as shown in the image below:
Step 10: Put the Wilton 1M tip on a pastry bag and fill the bag with red icing. Start placing rows of red icing stars over where you iced the cake with the red icing. To make the stars, hover the tip over the section of the cake you want to ice, squeeze the pastry bag gently and lift as you gently release. Make stars in rows, repeating your icing motion. Keep repeating the rows up to the top edge of the cake, and around the end.
Step 11: Switch the 1M tip to a pastry bag with orange icing and make a row of orange stars adjacent to the red at the top of the cake.
Step 12: Repeat the process to make rows of yellow, green, and blue stars, each adjacent to the next to form the rainbow. Don’t forget to continue the star rainbow onto the ends of the cake.
Step 13: Switch the 1 M tip to a pastry bag with violet icing, and fill in the bottom of the front of the cake with violet stars to complete the rainbow.
Note: If you need to feed a bigger crowd, you could add an iced 9 x 11 inch sheet cake to the bottom.
Want more cake decorating ideas?
- Cupcake Bouquet Recipe
- Turkey Mini-Cakes Recipe
- Princess Cake Recipe
- Spider Mini Cakes Recipe
- Good Witch Mini Cakes Recipe
- Santa Cupcakes Recipe
Find more fabulous, kid-friendly ideas from Linette Gerlach at The Kid's Fun Review.