I am so excited to share a delicious Gluten-Free Rainbow Bundt Cake recipe that you can make using a simple boxed mix, a little food coloring, and a few odds & ends from your pantry. This Rainbow Cake is made in a tube pan, versus a layered cake, and is a fun addition to your St. Patrick’s Day spread.
Walmart challenged me to share a St. Patrick’s Day project that you could create out of items from their store. You may remember my rainbow cakes in a jar that I created a couple of years ago. Now that I am eating gluten-free, I wanted to replicate the idea of a rainbow cake, but I wanted to do it in one pan and I wanted to make it a quicker process by using a cake mix.
To make a vibrantly colored cake, I want to point out that it is really important to use good icing colors to achieve your rainbow cake colors. Over by the party supplies, you will find professional cake decorating supplies at Walmart. You want to purchase the Wilton Icing Colors. These concentrated gels offer a much brighter color than what you will find over in the baking section of the grocery section. I just use a toothpick to dip in the gel and then swirl it through my cake batter. You may need to do this a couple of times to achieve this level of brightness, but it still will take a lot less than the other brands of food coloring.
When I decided I wanted to make this cake, I went through tons of tons of cake recipes to figure out how to layer the batter. My inspiration for creating my rainbow arch was from not martha and her Leprechaun Trap Cake that she created a few years ago. Her arch is so much more beautiful than mine. I highly encourage you to read her tutorial for a perfect arch and read mine for a just meh arch. That being said, do prepare this in a tube pan versus a bundt pan to achieve the best arch.
Do you have a digital scale? I highly recommend purchasing one because it will make projects like this a million times easier. I have had mine for many years and I use it for both weighing packages and as a food scale! Be sure to tare it with the bowl on top to begin your measurements each time.
I used the measurements outlined by not martha for measurements for my batter:
- 6 ounces – red
- 5 ounces – orange
- 4 ounces – yellow
- 3 ounces – green
- 2 ounces – blue
- 1 ounce – purple
- The remainder of the rest of the batter, leave it white.
To scoop batter into the bowls, I relied upon an ice cream scoop to scoop it into the bowls on the scale. To make pouring the batter easier, place the cake batter in a baggie in a tall glass and hang the opening over the sides of your glass. Pour your batter in and then seal the baggie. Just snip a corner of the baggie to begin pouring your batter into the pan.
Gluten-free cakes tend to be more delicate so you definitely want to let this fully cool before trying to work with it. The side that has all the beautiful vibrant colors is not the top of the cake. It is the bottom of the cake. I accidentally iced this side so don’t make my mistake. If you find that your cake is puffy on the bottom, use a serrated knife to even it up a bit so your cake is not lopsided.
I posted a picture of this cake as I was glazing it on Instagram. To quote myself, “I never go easy on the sprinkles. I consider them the jazz hands on my desserts.”
Who quotes themselves? Sorry about that!
Glaze and sprinkle this cake liberally!
I was disappointed that I had iced the wrong side and that my purple didn’t get perfectly centered. I think it is one of those cakes that might take a little more practice. My friends didn’t seem to notice or mind my errors though because this was one yummy cake! I doubt your kids would notice or care either. It might be a fun one to try together!
I hope you love it as much as we did and I hope this tutorial helps you while you make your own gluten-free rainbow cake!
- 1 Hodgson Mill Gluten-Free Yellow Cake Mix (over by the gluten-free ingredients in the candy aisle of your store, not in the baking aisle)
- ½ cup butter softened
- 2 large eggs, room temperature
- 1 cup buttermilk
- 2 teaspoons vanilla extract
- 1 package of Wilton Gel Food Colorings
- 1½ cups confectioners’ sugar
- 2½ teaspoons milk (or milk substitute)
- ⅛ teaspoon salt
- ¼ teaspoon vanilla extract
- 1 teaspoon butter
- Rainbow Sprinkles
- Preheat oven to 350 degrees. Grease a tube pan liberally with cooking spray.
- In a mixing bowl, cream butter until soft. Add cake mix and blend completely.
- Add eggs, buttermilk, and vanilla extract and beat until completely blended. The batter will be thick.
- Divide your batter into eight bowls using the measurements in this post and tint accordingly.
- First pour the larger amount of white batter into the pan. Then pour the red batter in, making it a wide ring of batter. Then pour the orange over that, keeping it inside the red. Pour in each color, creating smaller and smaller rings.
- Bake at 350 degrees for 40-50 minutes, testing with a toothpick to check when the cake is done.
- Once the cake is cooled, prepare your icing.
- Melt the butter and add to rest of ingredients. Mix until creamy.
- Spoon the glaze over your cake and finish with rainbow sprinkles.
Enjoy this tasty treat with a DIY Shamrock Shake and our free St. Patrick’s Day straw printable!