Rainbow Sprinkle Cake

Use this cake decorating tutorial to make an easy rainbow sprinkle cake. Colorful vanilla cake is covered in white chocolate buttercream frosting, sprinkles and a fondant rainbow topper. Great for kids birthday parties or even St.Patrick's day!

When it comes to desserts, rainbows and sprinkles are still very popular, not only with kids but adults as well. Today's cake is just so fun and colorful and easy enough for beginners. For more inspiration, be sure to check out these Rainbow Desserts and if you are making this for St.Patrick's Day, there are lots of Green Desserts (St. Patrick's Day Desserts) for you to check out as well.

If you like making birthday cakes for family and friends, you really must scroll through these Easy Cake Decorating Ideas and these fantastic Birthday Cake Ideas.

How to make rainbow sprinkle cake?

1. Bake cakes- And let them cool.
2. Make frosting- There is no need to color it.
3. Assemble- Place one cake on stand, ice the top, place other cake on top, ice entire cake.
4. Decorate- Cover entire cake with sprinkles and add a fondant topper.

Variations

Use pastel colors- This is with regards to sprinkles and the fondant colors for the rainbow topper. The colors won't be as vibrant but still very pretty.

Try other cake flavors- Such as Red Velvet Cake or Pistachio Cake.

Filling ideas- Try jams and preserves, peanut butter, Nutella, ganache, caramel sauce, dulce de leche, thick custard or pudding, fresh fruits, chopped up candy bars.

Try other frosting flavors- Such as Lemon Frosting or Maraschino Cherry Frosting.

Consider other decorations- Such as colorful candles or sparklers or store-bought toys or candies or even cardboard toppers.

Make a larger cake- This was a small cake but you can make an 8 inch or 9 inch cake.

Make layer cake- Make another set of 3 inch cakes and stack them on top of the 6 inch cakes. Use dowels for support.

Try a pinata cake- Follow the instructions for this Pinata Cake and fill the inside with lots of sprinkles and mini candies. It's an exciting surprise when you cut into the cake.

Tips and Techniques

This wacky rainbow has 5 weird colors- Red, yellow, dark blue, brown and light blue. I was using up leftover fondants from old projects. Please feel free to use my tutorial to make a proper rainbow.

Don't frost or decorate warm cake- Because that will cause the icing to melt into a sticky mess.

For faster drying- Use gum paste or 50/50 (mixture of half fondant and half gum paste). You can also aim a small table fan at the rainbow overnight so that it dries quicker.

Be gentle when covering cake in sprinkles- Because if you press the sprinkles too hard, it will make dents in the frosting.

Line pans with parchment paper- Because that allows the cakes to be removed easily without breaking or sticking.

Place plate of iced cake in large, deep pan- This is very important because the large tray will catch all the sprinkles falling from the cake or else they will end up everywhere in your kitchen.

Keep decorated cake away from moisture- Because that will cause the fondant topper to become sticky and the sprinkles will start to bleed color.

The topper must be dry- If the rainbow is not completely dry, it will not hold its curved shape.

Drying time of topper will vary- This depends on where you live and the humidity in your area. Higher humidity= Slow dry time.

Storage

Refrigerate- Leftovers can be stored in a sealed container in the fridge for up to 3 days.

Freeze- Unfrosted cakes can be stored in a sealed container for up to 1 month. When you are ready to enjoy it, let it thaw in the fridge overnight and then, decorate as per instructions below.

Make ahead instructions- This cake can be baked and decorated 1 day in advance and stored at room temperature until you are ready to serve.

More Decorated Cakes

• Easy Cereal Cake
• Tie Dye Shirt Cake
• Blue Ombre Cake
• Butterfly Cake
• Easy Galaxy Cake
• Back to School Pencil Cake

Recipe