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Pastel Rainbow Birthday Cake

This simple and pretty Chocolate Vanilla Raspberry Pastel Rainbow Cake is perfect for birthday celebrations.

Rainbow frosted cake displayed on milk glass cake stand.

updated post from 2011

HOW TO MAKE PASTEL RAINBOW CHOCOLATE RASPBERRY CAKE

To make this cute rainbow cake I paired delicious moist chocolate cake with a homemade raspberry cake filling and cream cheese frosting. It’s so good!

Cake slice on a plate.

I decorated top with homemade rainbow sprinkle mix and simple piped rainbow stars.

Top of the cake decorated with rainbow sprinkles.

CHOCOLATE CAKE

To make this pretty pastel rainbow cake I used 2 baked 6-inch cakes that I trimmed and torted so I had a total of 4 cake layers that I filled with fillings.

First you need to bake chocolate cakes. Let them cool and trim the tops before filling and frosting the cakes. My easy chocolate cake recipe bakes 4 – 6 inch cakes, or 2 – 8/9 inch cakes. You can easily half the recipe and make only 2 – 6 inch cakes or bake all 4-6 inch cakes and freeze 2 cakes for later.

TIP : You can bake the cakes couple of days and even weeks before and freeze them. Let the cakes defrost overnight in the fridge before filling.

Trimming the top of the cake.

RASPBERRY FILLING AND CREAM CHEESE FROSTING

I love fruit fillings. Whether it’s tart fruit jam, lemon curd, raspberry curd or my easy to make delicious raspberry filling. Raspberry filling pairs wonderfully with moist chocolate cake and vanilla cream cheese frosting. So, let’s fill the cake.

TIP : Find recipes at the bottom of this post. And Cream Cheese Frosting Recipe is listed in the recipe card.

Cream cheese frosting and raspberry filling in bowls.

FILL THE CAKE

Spread a little bit of cream cheese frosting onto the cake board and then place first chocolate layer on the cake board. Spread a generous spoonful of raspberry cake filing onto the cake, (step 1-8).

Spreading raspberry filling onto a cake.

Take a small cookie scoop and place 3 scoops of cream cheese frosting onto chocolate cake with raspberry layer. Spread the frosting over the cake in one even layer. Repeat layering cake, raspberry filling and cream cheese frosting, (step 1-5).

Cream cheese frosting tends to be on a softer side and so I decided to also place a support inside of the cake. Just in case cake layers decided to shift a little. I used a drinking straw as a cake dowel. Insert a drinking straw in the center of the cake. Then trim the excess with scissors, (step 6-8).

Spreading cream cheese filling on the cake layers.

CRUMB COAT THE CAKE

Crumb coat the cake and seal in all the cake crumbs. Spread a thin layer of frosting on the top and sides. Smooth it with a spatula and chill the cake until ready to frost with pastel rainbow frosting, about 2 hours.

TIP : If frosting gets too soft and cake layers seem to be sifting, chill the cake for 20 minutes before crumb coating.

Crumb coating cake with cream cheese frosting.

FROST THE CAKE

Divide about 3 cups of cream cheese frosting into 7 bowls. Color 6 of those with gel food colors. Leaving 1 portion uncolored ( I used this portion to frost the top of the cake). To make the pastel frosting colors only add little bit of food coloring. More you add more intense the color will be, (step 1-4).

Fill the piping bags with colored cream cheese, (step 5-8).

Frosting divided into bowls and colored with rainbow food colors.

HOW TO FROST PASTEL RAINBOW CAKE

To frost the top of the cake I used white uncolored cream cheese frosting on the top and pastel rainbow cream cheese frosting on the sides.

First spread a layer of white frosting on the top. Smooth it with a spatula.

Spreading frosting on top of the cake.

First take a piece of paper and measure the height of the cake. Then divide the height number by 6, number of rainbow colors. Then with a toothpick mark the sections onto the cake, (step 1-4).

Measuring height of the cake and dividing the cake into even sections.

Start piping red rainbow cream cheese frosting at the bottom all the way to the marked section. And then continue piping remaining rainbow colors, finishing up with purple frosting, (step 1-4).

TIP : Cream cheese frosting can become too soft. If that happens I’d recommend that you chill the cake for 10-15 minutes before you try smoothing it. Cream cheese doesn’t behave like Swiss or American buttercream. Cream cheese frosting is more flexible. And it is a bit harder to smooth it out completely. This is okay. Don’t worry about it too much.

Piping rainbow buttercream on the side of the cake.

Smooth the sides with a flat icing comb. Wipe the edge clean after each time, (step 1-2).

Smooth the top by bringing the icing inwards with a spatula, (step 3-4).

Smoothing sides of the with a decorating spatula.

HOMEMADE RAINBOW SPRINKLES MIX

This chocolate raspberry birthday pastel rainbow cake wouldn’t be complete without rainbow sprinkles.

I decided to make my own rainbow sprinkles. It’s super simple. Into a bowl pour yellow, purple, green and pink jimmies sprinkles and stir well to combine. Aren’t they pretty?!

Colorful sprinkles in a bowl.

RAINBOW FROSTING STARS

To make rainbow stars pipe rainbow frosting onto a food wrap and form it into a pouch, (step 1-6).

Piping rainbow frosting onto a food wrap

Fit a piping bag with a star tip. Trim the end of the pouch and fit it into a piping bag.

TIP : For best results chill the pouch for 10 minutes before using

Fitting a piping bag with a start tip and filling it with rainbow frosting.

DECORATE PASTEL RAINBOW CAKE WITH SPRINKLES AND RAINBOW STARS

Once the cake was frosted I spread a layer of rainbow sprinkles on the top. You can use a spoon to press the sprinkles into the frosting a little so they don’t wander around. Leave a border of ¾ inch.

With a prepared rainbow frosting pipe rainbow frosting stars close to the edge.

Decorating top of the cake with rainbow sprinkles and piped swirls

HOW LONG DOES THE CAKE KEEP?

Store the cake in the fridge, if possibly loosely covered. Cake keeps in the fridge for up to a week. Let it come to room temperature before serving.

Decorated cake on a cake stand.
Slice of a cake on a plate.

TO MAKE PASTEL RAINBOW CAKE YOU NEED

  • RECIPES
  • Easy Chocolate Cake Recipe – you only need 2 baked cakes (trimmed and torted = 4 cake layers) to make this Rainbow Pastel Cake. You can half chocolate cake recipe or make 2 – 8/9 inch cakes, or freeze cakes you won’t use for later
  • Raspberry Cake Filling
  • Cream Cheese Frosting – in the recipe card
  • TOOLS
  • Find all the tools in my Amazon Shop
  • Cake Turntable
  • Piping Bags
  • Star Piping Tip
  • Cake Board
  • Food Wrap
  • Rainbow Sprinkles
  • Spatula

MORE RAINBOW DESSERTS :

Pastel Rainbow Chocolate Raspberry Cream Cheese Cake
Prep Time
10 mins
 

Makes 1- 6 inch cake or 1 slightly shorter 8 inch cake

Course: Cake, Dessert
Cuisine: American
Keyword: cream cheese frosting, pastel rainbow cake, rainbow cake
Servings: 10
Hanielas.com: Hani Bacova
Ingredients
CHOCOLATE CAKE
  • 1/2 batch Easy Chocolate Cake Recipe – check notes
RASPBERRY CAKE FILLING
  • 1 batch Raspberry Cake Filling Recipe – check notes
VANILLA CREAM CHEESE FROSTING
  • 2 pkg full fat cream cheese at room temperature (1 package is 226 grams)
  • 2 1/2 sticks unsalted butter at room temperature (1 stick is 113 grams)
  • 7-8 cups powdered sugar
  • 2 tsp Vanilla Extract
  • 4 tbsp whipping cream o heavy cream
  • pinch of salt
Instructions
VANILLA CREAM CHEESE FROSTING
  1. With a paddle attachment in a bowl of your mix cream unsalted butter (2 sticks and 1/2 stick) for 2 minutes. Then gradually beat in room temperature cream cheese (2 pkg, 2 packages are 452 grams). Beat until smooth, about 2 minutes.

  2. Gradually beat in powdered sugar (7-8 cups) alternating with heavy cream (4 tbsp). About 5 minutes. Lastly beat in Vanilla Extract (2 tsp).

    TIP : Sift powdered sugar if it has lumps.

  3. Cream cheese frosting doesn't firm up like all butter buttercream. It if it is too soft chill the frosting covered for 20 minutes.

  4. Color frosting with concentrated gel colors. Avoid using liquid colors.

Recipe Notes
  • Easy Chocolate Cake Recipe :
  • You only need 2 to baked chocolate cakes (trimmed and torted – total of 4 cake layers) to make this Rainbow Pastel Cake, you can half chocolate cake recipe or make 2 – 8/9 inch cakes, or freeze cakes you won’t use for later.
  • Raspberry Cake Filling

CAN I USE STORE BOUGHT RASPBERRY JAM ?

Absolutely.

Cake slice on a serving plate.

This post was originally published on July 25th, 2011. On March 5th, 2020 I updated this post with new step by step photos and written text.

This post contains Amazon affiliate links that earn me a small commission, at no cost to you. I only recommend products that I use and love. Learn more about my affiliate policy here.

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