Vegan Gluten-Free Vanilla Sheet Cake with Rainbow Frosting

This vegan and gluten-free vanilla sheet cake has a vibrant rainbow swirl frosting that makes it extra festive.  The cake is light, fluffy and perfectly sweet.  Best of all, this easy recipe contains nutritious ingredients that you can feel really good about.

Vegan Gluten-Free Rainbow Sheet Cake

Vegan Gluten-Free Vanilla Sheet Cake with Rainbow Frosting

This festive vegan and gluten-free vanilla sheet cake has a vibrant rainbow frosting that is a show stopper for kids and adults.  I used natural food coloring paired with my vegan vanilla frosting and layered it onto the cake.  Then, I simply used a chop stick (so fancy!) to create the fun design.  The rainbow frosting pairs wonderfully with the light and fluffy vanilla cake.  It is any easy dessert yet super impressive and delicious.  The cake is made with simple nutritious pantry ingredients and is refined sugar-free.  

Vegan Gluten-Free Vanilla Cake with Rainbow Frosting

Gluten Free Vegan Vanilla Sheet Cake

Rainbow Sheet Cake

The story behind this vanilla sheet pan cake with rainbow frosting

My 7-year-old daughter, Riley, was invited to a friend’s birthday Zoom call over the weekend.  Everyone had to come prepared with a joke, art supplies for a group craft and a dessert to enjoy when the birthday girl blew out the candles.  Cute, right?  I asked Riley what kind of dessert she wanted to bake and she asked for vanilla cake with “rainbow tie-dye frosting” – right!  On it!  I searched the internet and Pinterest and couldn’t find anything.  I didn’t know quite what to do or how to make it work but we started with seven bowls and stirred the natural food coloring into each until the colors were just right. 

Rainbow Frosting Dye-Free

We then “painted” on the frosting in vertical layers and swirled it horizontally with a chop stick.  Riley was absolutely thrilled with the result and said I had to add this one to the blog.  When I shared pictures of the cake on Instagram stories you all agreed.  So here it is.  While not tie-dye at all I think we can all agree it is definitely a rainbow cake – and totally kid-approved.  She was the envy of all her Zoomer friends when everyone showed off their desserts. 

Vegan Rainbow Cake

So, for your next virtual (or hopefully soon real life!) celebration, I hope you consider this fun, vibrant, festive rainbow cake.  The best part about this cake is you can really use this recipe to decorate it however you want.  You can do all one color or just a couple.  You can swirl, or not.  Whatever you want.  This is a super easy cake recipe (hello sheet pan cake!) and can be totally customized to your color preferences.  

More Festive Dessert Recipes

More celebrations ahead? These festive dessert recipes are all vegan, refined sugar-free and gluten-free:

Grain-Free Chocolate Chip Cookie Cake

Skillet Vanilla Cake

No-Bake Birthday Cake Energy Bites

Healthy Birthday Cake Smoothie Bowl

Vegan Chocolate Sweet Potato Cupcakes

Gluten-Free Vanilla Sheet Cake

 

Now, Let’s Make Vegan Gluten-Free Vanilla Sheet Cake with Rainbow Frosting!

This easy vanilla sheet cake recipe will be your new go-to dessert for festive occasions.  It is naturally vegan, gluten-free, peanut-free, legume-free and refined sugar-free (without the frosting) so it works well for many types of diets. 

I cannot wait for you to give this recipe a try!  Let’s get baking!

Rainbow Cake

Vanilla Sheet Cake

Print
clock clock icon cutlery cutlery icon flag flag icon folder folder icon instagram instagram icon pinterest pinterest icon print print icon squares squares icon
Vegan Gluten-Free Vanilla Cake with Rainbow Frosting

Vegan Gluten-Free Vanilla Sheet Cake with Rainbow Frosting


  • Author: Elaine Gordon
  • Prep Time: 15
  • Cook Time: 30
  • Total Time: 45 minutes
  • Yield: 16 1x
  • Diet: Vegan

Description

This vegan and gluten-free vanilla sheet cake has a vibrant rainbow swirl frosting that makes it extra festive.  The cake is light, fluffy and perfectly sweet.  Best of all, this easy recipe contains nutritious ingredients that you can feel really good about.


Scale

Ingredients

  • 3 cups gluten-free old fashioned oats
  • 2 teaspoons baking powder
  • 1/2 teaspoon fine salt
  • 1 cup plain, unsweetened plant-based milk (I have tested with oat and almond milk)
  • 1/2 cup pure maple syrup
  • 1/2 cup avocado oil
  • 1 tablespoon vanilla extract
  • 2 batches of Vegan Vanilla Frosting (divided into seven tiny bowls for separate food coloring)

Instructions

  1. Preheat oven to 350 degrees Fahrenheit. Lightly grease an 8 x 8 baking pan with avocado oil or coconut oil and set aside.
  2. In a high speed blender, add the oats and blend on the highest speed until a super fine oat flour forms. There should be no oat chunks remaining. Place the homemade oat flour into a mixing bowl.
  3. Add baking powder and salt and stir well to combine. Add milk, maple syrup, avocado oil and vanilla and stir again until well combined.
  4. Pour the cake batter into the greased baking pan and bake for 30 minutes.
  5. While the cake bakes, make a double batch of the vegan vanilla frosting.  Divide the frosting evenly into seven tiny bowls and add 8-10 drops of natural food coloring to each bowl.  Stir with a spoon to distribute the color evenly.  Store the frosting bowls in the refrigerator until ready to use.
  6. When the cake is finished baking allow it to fully cool before frosting it. I like to stick the entire pan in the freezer to speed up the process.  Once fully cooled, gently spread the colored frosting onto the cake in an even layer.  It is okay if the colors overlap slightly.  For this particular design, I start with red and then do orange, yellow, green, blue, purple and pink vertical lines.  Then I use a chopstick to make horizontal lines in the opposite direction (this makes the pattern you see in the pictures but you can swirl however you want – just don’t over-swirl or the colors will combine to create brown).  Garnish your cake with dye-free sprinkles if desired. You can also garnish the cake with crushed freeze dried raspberries.
  7. Slice into 16 slices and enjoy.  Store leftovers in an airtight container in your refrigerator.  Allow the cake to come back to room temperature before enjoying.

  • Category: Dessert
  • Method: Oven Baked

Keywords: Rainbow Vanilla Cake

Follow Eating by Elaine on PINTEREST | FACEBOOK | INSTAGRAM for all the latest content and behind the scenes!

Subscribe to the Eating by Elaine Weekly e-Newsletter and receive simple, nutritious recipes in your inbox every week!

You can visit my Shop page for a complete listing of all my favorite kitchen and cooking products. 

Did You Try This Recipe?

Follow Eating by Elaine for all the latest content and behind the scenes!

Want to receive simple, nutritious recipes in your inbox every week?

Need a complete listing of all my favorite kitchen and cooking products?

2 Comments

  1. Mary

    I failed somewhere because mine came out very dense. It tasted more like a heavy plain donut. The rainbow frosting came out great.

    Reply
    • Elaine Gordon

      Oh no! I’m so sorry to hear that, Mary! Did you use store-bought oat flour? If you made it yourself to you blend it into a super fine flour? If you made it yourself did you measure out the oats before blending as opposed to the oat flour after blending? Please let me know so I can help you for next time! Best, Elaine

      Reply

Submit a Comment

Your email address will not be published. Required fields are marked *

Hi, I’m Elaine!

Thank you for checking out my vegan and gluten-free recipes.

Trending Now

Follow Eating by Elaine for all the latest content and behind the scenes!

Want to receive simple, nutritious recipes in your inbox every week?

Need a complete listing of all my favorite kitchen and cooking products?