
A rainbow layer cake is a fun and creative dessert that is perfect for any occasion. With its bright and colourful layers, it's sure to bring a smile to anyone's face. The best part is that it's not as difficult to make as it seems! You can use a simple vanilla cake mix or make the batter from scratch, and the thin layers bake and cool quickly. The key to a beautiful rainbow cake is even layers and vibrant colours, which can be achieved with gel food colouring. Once the layers are baked and cooled, it's time to assemble the cake with a delicious frosting, such as vanilla buttercream or chocolate, and decorate it with rainbow sprinkles. So, get your cake pans ready and let's bake a rainbow!
| Characteristics | Values |
|---|---|
| Number of layers | 6 |
| Layer thickness | Not as thick as a normal cake layer |
| Cake height | Tall |
| Cake colour | Bright and colourful |
| Cake flavour | Vanilla |
| Cake texture | Light and tender crumb |
| Frosting flavour | Vanilla buttercream, chocolate buttercream, or cream cheese frosting |
| Frosting colour | White or chocolate |
| Frosting texture | Silky smooth |
| Toppings | Rainbow sprinkles, sugared confetti |
| Baking temperature | 325-350°F |
| Baking time | 10-20 minutes |
| Cooling time | 10-30 minutes |
| Assembly | Stack layers in order of the rainbow, spread frosting between layers, frost the top and sides |
| Storage | Refrigerate until ready to eat, can be stored for up to 3 days at room temperature or 1 month in the freezer |
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$39.75 $47.9
What You'll Learn

Choosing the right cake mix
To make a rainbow layer cake, you'll need a cake mix that can be tinted with different colours to create the rainbow effect. Here are some things to consider when choosing the right cake mix:
Type of Cake Mix
Look for a cake mix that will result in a light-coloured batter, preferably white or vanilla. This is because you want the colours to be as vibrant and bright as possible, and a light-coloured batter will allow the food colouring to really pop. Avoid cake mixes that will result in a yellow batter, such as butter cake. White velvet cake mix is a great option, as it can be easily tinted without affecting the texture of the cake.
Ingredients
The ingredients in the cake mix will also play a role in the final colour and texture of your rainbow cake. If you're making the cake from scratch, use a combination of all-purpose flour, sugar, butter, eggs, and buttermilk. Buttermilk is especially important as it contributes to a soft and moist crumb, as well as adding flavour to the cake. If you're using a store-bought cake mix, make sure to follow the instructions on the package and have all the necessary ingredients on hand.
Number of Layers
Most rainbow layer cakes have six layers, each tinted a different colour of the rainbow. Keep in mind that you'll need enough cake mix to make multiple layers. You can either bake each layer separately or divide your cake mix into multiple bowls and tint each one with a different colour. If you're baking each layer separately, you'll need enough cake mix to make at least six layers. If you're dividing the cake mix, make sure you have enough to divide it evenly among the number of colours you plan to use.
Food Colouring
When choosing a cake mix, also consider the type of food colouring you'll be using. Gel food colourings tend to result in brighter colours compared to liquid food colourings. Look for cake mixes that are compatible with gel food colourings to get the most vibrant rainbow layers.
Baking Instructions
Finally, consider the baking instructions for the cake mix. Rainbow layer cakes are typically baked in multiple thin layers, so choose a cake mix that can be baked in a thin layer without becoming dry or crumbly. Follow the package instructions for baking time and temperature, and adjust as needed for the number of layers you're creating.
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Preparing the cake batter
To prepare the batter for a rainbow layer cake, you will need a stand mixer or a large mixing bowl. The key ingredients are all-purpose flour, sugar, butter, eggs or egg whites, and buttermilk. You can also add cornstarch, baking soda, baking powder, and salt to enhance the texture and flavour.
Firstly, mix the dry ingredients (flour, cornstarch, baking soda, baking powder, sugar, and salt) in your chosen mixing vessel. Cut the butter into 1-inch pieces and slowly add them to the dry mix while the mixer is running on low speed. Continue mixing until the flour mixture resembles fine sand with no large pieces of butter, which should take about 30 seconds.
Next, pour in the oil and buttermilk, mixing on low speed until everything is thoroughly combined. This should take around 1 to 2 minutes. Then, slowly add in the egg whites, one at a time, followed by any desired extracts, such as vanilla or almond extract. Mix until everything is just incorporated.
At this point, you should have a basic white cake batter. To create the rainbow layers, divide the batter evenly into separate bowls—one for each colour. It is recommended to use gel food colouring to achieve bright and vibrant colours. Add a small amount of colouring to each bowl and mix until you reach the desired shade.
You can bake the layers separately, or if you have multiple cake pans of the same size, you can bake them together. Preheat your oven to a temperature between 325°F and 350°F, depending on your pan type. Line your pans with parchment paper and grease them with a light spray of non-stick cooking spray. Pour the batter into the pans, ensuring they are filled no more than halfway for thin, even layers.
Now you are ready to bake your colourful rainbow cake layers!
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Baking the layers
To make a rainbow layer cake, you'll need to bake each layer separately. Don't worry, it's not as labor-intensive as it sounds! The layers bake and cool quickly, so you won't lose too much time. Here's a step-by-step guide:
First, preheat your oven to 325 °F (or 350°F, depending on the pan you're using). Line your cake pans with parchment paper and grease them lightly with a non-stick cooking spray. You'll need six 8-inch pans for a traditional rainbow cake, but if you don't have that many, don't worry—you can bake the layers in batches. Just be sure to keep your cake batter in the fridge while the other cakes are baking.
Next, prepare your cake batter. For a rainbow cake, it's best to use a vanilla cake mix or a white velvet cake recipe to ensure the colours stay true and vibrant. You can make the batter from scratch or use a store-bought mix. If making from scratch, mix together the flour, cornstarch, baking soda, baking powder, sugar, and salt in a large mixing bowl or stand mixer. Cut the butter into 1-inch pieces and slowly add them to the dry mix while the mixer is on low speed. Continue mixing until the mixture looks sandy and crumbly, about 30 seconds. Then, pour in the oil and buttermilk and mix until combined. Slowly add in the egg whites, followed by the vanilla and almond extracts.
Once your batter is ready, divide it evenly into six separate bowls. This is where you'll add your food colouring to create the rainbow layers. It's recommended to use gel food colouring, as it makes the colours brighter. You only need a small amount—about 1/4 teaspoon—to achieve vibrant hues. Tint one bowl red, another orange, and so on, until you have all the colours of the rainbow.
Now you're ready to bake! Pour the batter into your prepared pans and bake for 10 to 20 minutes, or until a toothpick inserted into the centre comes out clean. The thinner layers of a rainbow cake bake up quickly, so keep an eye on them to avoid overcooking. Once they're done, let the cakes cool for about 10 minutes before removing them from the pans to cooling racks. Allow them to cool completely before assembling your cake, about 30 minutes.
If you want to bake the layers ahead of time, you can wrap them twice in plastic wrap and store them in the freezer for up to a month. When you're ready to assemble the cake, let the layers thaw at room temperature for about 10 to 15 minutes.
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Making the frosting
If you're short on time, you can use store-bought frosting, such as Betty Crocker's Classic Vanilla Frosting or Cream Cheese Frosting. You could also use whipped cream as a quick and easy alternative to buttercream.
When making buttercream frosting, it's important to note that the frosting can be made ahead of time and stored in the fridge for up to a month. When you're ready to use it, simply leave it out at room temperature for a day until it's soft again, then mix it in a mixer for 2-3 minutes until smooth and fluffy.
Once your frosting is ready, you can start assembling your rainbow cake. It's recommended to use a thin layer of frosting between each cake layer, then frost the top and sides of the cake. You can use an offset spatula or the back of a butter knife to smooth the sides and top of the cake, creating a nice, even thickness of frosting.
To add a decorative touch, you can press rainbow sprinkles onto the frosted sides of the cake. You can also pipe rosettes of buttercream along the top edge and sprinkle them with rainbow sprinkles. For a neat finish when slicing the cake, chill it in the freezer for 20-30 minutes before using a hot, sharp knife to cut clean slices.
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Assembling the cake
Assembling a rainbow layer cake is not as difficult as it seems. Here is a step-by-step guide to help you through the process:
First, place your first layer of cake onto a cake board or stand. It is recommended to work on a turntable for convenience. For the first layer, you can choose any colour you like, such as purple or pink.
Next, apply a thin layer of frosting, such as buttercream, to the first layer. Aim for about 1/4 inch of frosting. Use a spatula to ensure that the frosting has an even thickness.
Now, continue stacking and frosting the rest of the layers in the order of the rainbow. Spread a thin layer of frosting between each cake layer. You can use any frosting you like, such as vanilla buttercream, chocolate frosting, or cream cheese frosting.
Once all the layers are stacked, frost the top and sides of the cake. Use a generous amount of frosting and smooth it out with an offset spatula or the back of a butter knife. Don't worry about making it too neat, as you can add more icing to the edges later.
Finally, decorate the cake with rainbow sprinkles, confetti, or any other toppings of your choice. You can also pipe rosettes of buttercream along the top edge of the cake and sprinkle them with rainbow sprinkles.
Your rainbow layer cake is now assembled and ready to be served! Store the cake in the fridge until you are ready to eat it. Enjoy the colourful and delicious treat!
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Frequently asked questions
You will need flour, cornstarch, baking soda, baking powder, sugar, salt, butter, oil, buttermilk, egg whites, vanilla extract, almond extract, and food colouring.
Gel food colouring is recommended as it makes the cake brighter and more vibrant.
Preheat your oven to 325 °F (162 °C) for a dark or non-stick pan, or 350 °F (176 °C) for a regular pan.
Bake for 17 to 20 minutes, or until a toothpick inserted into the centre comes out clean.
First, frost the cake with buttercream, vanilla buttercream, or chocolate frosting. Then, add rainbow sprinkles to the sides and top of the cake.
















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