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    Home > Meal Type > Baking

    Mini Rainbow Cakes (Guest Post)

    Last Updated: Jun 28, 2025 · First Published: Feb 21, 2017
    Author: Claire | Sprinkles and Sprouts · Comment: 4 Comments

    Jump to Recipe SaveSaved!
    3.84 from 6 votes
    Close up on the 6 layers in these rainbow cakes

    Aren't these Mini Rainbow Cakes so perfect!!!! Brightly coloured mini cakes that are perfect for parties. Whether that is a St. Patricks day party or a cake to celebrate LGBT during Pride month. These individual rainbow cakes are going to be a hit.

    A mini 6 layer rainbow cake sat on a mini white cake stand.

    Aren't they just super fun! Plus I love the neat trick for not wasting cake and making it easy to put together for a party. I'll hand it over to Meaghan.


    Hi, Sprinkles & Sprouts readers! My name is Meaghan and I blog over at Cook. Craft. Love. where I share mostly sweet treats, simple meals, and tasty snacks. But occasionally you'll see a random printable or craft idea running around. I'm super excited to be here today sharing this fun and easy recipe for mini rainbow cakes with you!

    I've been wanting to make these fun little rainbow cakes for awhile and finally got around to it when Claire asked me if I would share a cake recipe with y'all. They're so easy that you can easily make these when you are getting ready for a party. Light assembly required. 😉

    These fun and bright cakes are made with cupcakes! I like doing mini naked cakes this way because they result in much less wasted cake. No one likes wasted cake. Plus this makes for a lot less clean up and a lot less time in the kitchen. Unless you enjoy making 6 different batches of cake.

    These cupcakes don't puff up into a big rounded top so you won't have to do much more than cut the caramelization off the top and bottoms. These will slice the best and with the least amount of crumbs if you pop them in the freezer for about 15 minutes first.

    Want to save this recipe?

    We'll email this post to you, so you can come back to it later!

    white table with green napkin and 3 mini rainbow cakes on it.

    Once they're all sliced and you have about 3 cups of your favorite vanilla buttercream ready to go set up an assembly line and go to town! To rainbow town 😉

    I used a piping bag without a nozzle but you can certainly use an offset spatula or just a butter knife if that's all you have on hand. Just have fun!


    If you want to see more of Meaghan's Recipes then check out her blog Cook.Craft.Love. Or find her over on Facebook.


    Why not pin this recipe for these Mini Rainbow Cakes for later. Pin it here

     

    Get the Recipe

    Aren't these Mini Rainbow Cakes so cute!!!! Brightly coloured mini cakes that are perfect for the kids to make.

    Mini Rainbow Cakes

    Claire | Sprinkle and Sprouts
    These mini rainbow cakes are perfect for a party. Easy to make and with no wasted cake. Make these for Pride month or St. Patricks day
    3.84 from 6 votes
    Print Recipe
    Prep Time 15 minutes mins
    Cook Time 20 minutes mins
    Total Time 35 minutes mins
    Course Cake
    Cuisine American
    Servings 18
    Calories 426 kcal

    Ingredients
     
     

    For the Cakes:

    • 2 cups caster sugar
    • 3 cups plain flour
    • 2 teaspoon baking powder
    • 1 teaspoon kosher salt
    • ¾ cup vegetable oil
    • 3 egg whites
    • 2 teaspoon vanilla
    • 1 ½ cups milk
    • red, orange, yellow, green, blue, and purple gel food color

    For the Frosting:

    • 2 cups unsalted butter (at room temp)
    • 4 ½ cups icing sugar
    • ½ tablespoon vanilla
    • milk (use to thin the frosting)

    Instructions
     

    • In the bowl of a stand mixer blend together the dry ingredients.
    • In a separate container mix the wet ingredients until combined and add them to the dry ingredients. Mix until just combined being careful not to over mix. 
    • Evenly distribute batter between 6 bowls and color one each red, orange, yellow, green, blue, and purple using about a pea sized amount of color. 
    • Fill lined muffin tins ⅔ full and bake at 350 degrees for 20 minutes or until a toothpick inserted into a center cupcake comes out clean. 
    • Allow to cool completely before slicing and assembling. Once cooled (for best results freeze for 10-15 minutes first) remove the rounded top of the cupcake and set aside.
    • Then cut 3 even slices about ¼" thick from each cupcake. Be careful to keep them stacked in order of top, middle, and bottom since a cupcake is slightly wider at the top than the bottom. This will be helpful for assembly. 
    • To assemble start with a purple layer, add about 1 Tbs of frosting, then the blue layer, and repeat in the reverse order of the rainbow ending with red. It's helpful to make your cakes line up and avoid falling over if you match up all the bottom pieces, all the middle pieces, and all the top pieces. 
    Tried this recipe?Let us know how it was!

    Nutrition

    Calories: 426kcal | Carbohydrates: 59g | Protein: 3g | Fat: 20g | Saturated Fat: 14g | Cholesterol: 29mg | Sodium: 149mg | Potassium: 116mg | Sugar: 42g | Vitamin A: 350IU | Calcium: 53mg | Iron: 1mg

    Nutrition is per serving

    For more great recipes follow me on PinterestFollow @sprinklessprout

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    Comments

    1. Just Jo says

      March 12, 2017 at 8:59 pm

      5 stars
      Oh *squeal* these are so much fun! I love the look of these bright wee little rainbows - I'm gonna have to get some chocolate coins to throw around their bases when I make them to complete the luck o' the Irish theme for St Patrick's Day!

      Reply
      • Claire McEwen says

        March 15, 2017 at 4:11 am

        They are so cute and fun aren't they!!! Meaghan did a great job with them!

        Reply
    2. cakespy says

      March 05, 2017 at 10:05 pm

      These are just so HAPPY. My pet unicorn (named Sprinkle, btw) approves.

      Reply
      • Claire McEwen says

        March 09, 2017 at 6:53 pm

        I love food that makes people happy 🙂
        Great name!!!

        Reply
    3.84 from 6 votes (5 ratings without comment)

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    a lady slurping pasta from a fork while holding a rustic bowl

    I'm Claire and I love food!!


    I dream about food and I am happiest when I am in the kitchen cooking. Whether that is dinner for my family, snacks for drinks with my girlfriends or testing new recipes for my site, the kitchen is my happy place. Sprinkles and Sprouts is where I share it all and I am so happy you are here.

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