Unicorn Bundt Cake

Jazz up a box cake mix for this Unicorn Bundt Cake with color, glaze and sprinkles. This semi-homemade cake would be perfect for a birthday!

Cut open this vanilla glazed bundt cake to find swirls of pretty colors inside! Whether you are throwing a birthday party, unicorn-themed party or it’s just a rainy day that needs brightening, this cake is one that will bring smiles all around.

a piece of bundt cake on a plate

Why you’ll love this cake:

  • Semi-homemade box cake mix with vanilla glaze.
  • Pretty swirls of color on the inside. Make it any color you’d like!
  • 3 ingredient vanilla glaze covering the top.
  • Bundt cake shape makes it look like a donut. 🤗

Can I make a cake mix in a bundt pan?

Yes you can! The issue is whether you need one cake mix box or two. If you have a small bundt cake pan (6 cups or less), then use 1 cake mix and halve the eggs, water and oil. If you use a large bundt pan (10-12 cups), you’ll want to use two cake mixes and the full eggs, water and oil that we list below.

Here’s the thing: No matter what you do, only fill the cake pan 2/3 full. If you fill it too full, the cake may overflow, and I’m unable to come clean your oven for you. 🙈 If you have leftover batter, make small loaf cakes or cupcakes (also filling those cups or pans 2/3 full).

How do you color cake batter?

The best food coloring to use is gel food coloring. It’s thick and more potent than liquid food color. Use 3-4 drops to start, then stir and add another drop or two only if needed.

For this recipe, I divided the batter into 5 bowls, used 4 colors, then left the last bowl white. You can use less colors if you’d like.

How do I keep my bundt cake from sticking to the pan?

The best way to prevent this comes before baking. The first two bullet points are the most important, but if you struggle with cakes sticking, try the other 3 tips as well.

  • Use cake release. This 3 ingredient formula works great nearly every time. OR….
  • Use Bake Easy non-stick spray. People LOVE this stuff and swear it works beautifully!
  • Don’t allow the batter to sit in the pan too long before baking. This can cause it to stick more than if you bake right away.
  • Only allow the cake to cool in the pan for about 10 minutes before turning it onto a plate.
  • Loosen the edge of the cake from the pan with a long knife before you turn it onto a plate.

Vanilla Glaze

Make glaze by adding powdered sugar, vanilla, and 2 tablespoons of milk to bowl. Mix with a whisk slowly, adding more milk one tablespoon at a time, until desired consistency is reached.

You’ll want the unicorn bundt cake to be completely cooled before drizzling the glaze over the cake. Because the glaze can form a sugar crust on top if it sits too long, I recommend waiting to make this until right before you drizzle the cake. You’ll also want to add sprinkles right away so that they stick to the glaze.

a piece of colorful cake
a piece of colorful cake

Unicorn Bundt Cake

4.25 from 4 votes
Jazz up a box cake mix for this Unicorn Bundt Cake with color, glaze and sprinkles. This semi-homemade cake would be perfect for a birthday!
Servings 12
Prep Time 20 minutes
Cook Time 55 minutes

Ingredients
 

For the cake:

  • 2 boxes white cake mixes (15.25 ounces each)
  • 6 large egg whites
  • 2 1/2 cups water
  • 2/3 cup vegetable oil (or canola oil)
  • 3-4 gel food colouring (colors of choice)

For the glaze:

  • 1 3/4 cup powdered sugar
  • 5-6 tablespoons 2% milk
  • 1 teaspoon vanilla extract
  • 1/4 cup sprinkles

Instructions
 

  • Preheat oven to 350 degrees Fahrenheit (175 degrees C). Grease large Bundt pan (10-12 cups or 9-10 inches in diameter) with shortening, then dust with flour. Or you can use Baker's Joy baking spray.
  • In the bowl of the stand mixer, add the cake mixes, eggs, water and oil. Mix well (with the whisk attachment), scraping the sides of the bowl as needed. Mix for about 2-3 minutes. Divide the cake batter evenly between 4 or 5 bowls (depending on how many colors you have). Add food colouring to all but one bowl, leaving that bowl as white batter.
  • Pour batter into prepared pan, one color at a time. You may not use all the batter, depending on the size of your pan. Fill the pan only about 2/3 full so that it doesn't overflow. If you have any leftover batter, bake cupcakes.
  • Bake the cake for 50-60 minutes, until toothpick inserted in the center comes out clean. Cool 10 minutes before loosening the edges of the cake and turning it out onto a wire rack to cool completely.
  • Make glaze by adding powdered sugar, vanilla, and 2 tablespoons of milk to bowl. Mix with a whisk slowly, adding more milk one tablespoon at a time, until desired consistency is reached.
  • Place the cake on a cake plate. Pour the glaze slowly over the cooled cake. Add sprinkles before the glaze sets.
  • Store the cake in an airtight container at room temperature.

Notes

The calories shown are based on the cake being cut into 12 pieces, with 1 serving being 1 slice of glazed cake. Since different brands of ingredients have different nutritional information, the calories shown are just an estimate. **We are not dietitians and recommend you seek a nutritionist for exact nutritional information. The information in the nutrition box are calculated through a program and there is room for error. If you need an accurate count, I recommend running the ingredients through your favorite nutrition calculator.**

Nutrition

Calories: 520kcal | Carbohydrates: 91g | Protein: 6g | Fat: 16g | Saturated Fat: 12g | Trans Fat: 1g | Cholesterol: 1mg | Sodium: 630mg | Potassium: 90mg | Fiber: 1g | Sugar: 57g | Vitamin A: 6IU | Vitamin C: 1mg | Calcium: 199mg | Iron: 2mg
Course Dessert
Cuisine American
Calories 520
Keyword birthday, bundt cake, multicolor cake

Other Bundt Cake Recipes

We have bundt cakes for all occasions and made with all flavors. Try one of these!

About Julie Clark

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What colours did you use in the cake? I love the way it looks!

5 stars
My family and I love this cake but every time I make it it overflows in the oven. I did se the Bundt pan and put a cookie sheet under it. Why does this keep happening. How can I avoid it??