Name: Unicorn Funfetti Cake Mix Bars with Colored Frosting Recipe
Prep time: 10 min
Cook time: 25 min
Total time: 40 min
Cuisine: American
Ingredients: 15.25 ounces box funfetti cake mix; 1 large egg; ½ cup salted butter (1 stick), melted; ½ cup heavy cream; 8 ounces package cream cheese, room temperature; ½ cup salted butter (1 stick), room temperature; 3½ cups powdered sugar; 1-3 tablespoons heavy cream; 1 teaspoon vanilla extract; Purple and blue food coloring; Sprinkles (optional garnish)

Jump to Recipe· 4.2 from 27 reviews

If you are searching for a treat that brings a party right to your taste buds, the Unicorn Funfetti Cake Mix Bars with Colored Frosting Recipe is exactly what you need. These bars are a magical twist on the classic funfetti cake, with vibrant swirls of colored frosting that make every bite feel like a celebration. Soft, colorful, and endlessly fun to make and decorate, these bars capture the joyful spirit of a birthday cake with the ease and convenience of a simple baking mix. Whether you’re surprising kids or adult friends, this recipe delivers a spectrum of sweetness and cheer all in one delightful pan.

Ingredients You'll Need

A large clear glass bowl sits in the center filled with pale beige cookie dough, with a large pile of dark brown chocolate chips sitting on top in one half of the bowl. Above to the left, a small clear glass bowl with smooth, creamy peanut butter in a warm orange-brown color. Next to it, there is a measuring cup partially filled with white liquid, likely milk. To the right, another clear glass bowl holds multiple square caramel candies in a light brown shade. A wooden spoon lies at the bottom right corner on a white marbled surface with subtle gray veins, and a white towel with a blue grid pattern peeks in from the bottom left. Photo taken with an iphone --ar 4:5 --v 7

Gathering the right ingredients for these bars is a breeze, but each one plays a vital role in crafting the perfect texture, flavor, and of course, that captivating look. From the airy funfetti cake mix base to the creamy frosting and playful colors, every component is essential for your Unicorn Funfetti Cake Mix Bars with Colored Frosting Recipe.

Funfetti cake mix (15.25 ounces): The foundation of the bars, packed with colorful sprinkles that create that signature funfetti appearance right inside the cake layer.

Egg (1 large): Helps bind the ingredients, providing structure to your chewy bars without making them dense.
Salted butter (1 stick, melted and 1 stick, room temperature): Butter adds richness and helps achieve that tender, moist crumb, plus it's essential for a luscious frosting texture.
Heavy cream (½ cup for mix, 1-3 tablespoons for frosting): Adds creaminess and keeps the cake moist, while creating a smooth, spreadable consistency in the frosting.

Cream cheese (8 ounces, room temperature): Gives the frosting a tangy depth and super smooth creaminess that pairs perfectly with the sweetness of the bars.
Powdered sugar (3½ cups): Sweetens and thickens the frosting for that light, fluffy finish.
Vanilla extract (1 teaspoon): Enhances all the flavors with warm, aromatic notes.

Food coloring (purple and blue): The star of the show for the colorful frosting that makes these bars feel truly magical.
Sprinkles (optional): Adds extra sparkle and whimsy right on top for that final party-ready flourish.

How to Make Unicorn Funfetti Cake Mix Bars with Colored Frosting Recipe

Step 1: Preheat and Prepare Your Pan

Start by heating your oven to 350 degrees Fahrenheit. Lightly grease a 9x13 inch baking pan or line it with parchment paper to ensure easy removal of the bars and a clean presentation. This step makes a difference in how neatly your bars come out of the pan.

Step 2: Mix the Base Ingredients

In a large bowl, combine the funfetti cake mix, egg, melted butter, and half a cup of heavy cream. Stir until everything is fully incorporated into a smooth batter. This mixture forms the colorful and fluffy base that brings the entire recipe to life.

Step 3: Bake the Bars

Spread the batter evenly into your prepared pan. Smooth it out so that each bite will be consistent in texture and thickness. Bake for 20 to 25 minutes—you’ll know it’s done when a toothpick inserted in the center comes out clean. This ensures the bars are perfectly baked and moist without being too soft.

Step 4: Cool Completely

Cooling is crucial before frosting to prevent melting and sliding. Set the pan aside and wait until the bars are completely at room temperature. This step can’t be rushed if you want that pristine frosting look.

Step 5: Whip Up the Frosting

In a clean mixing bowl, beat the cream cheese and room temperature butter together until totally smooth and creamy. This creamy base is what makes your frosting irresistible, balancing sweet and tangy beautifully.

Step 6: Add Sweetness Gradually

Slowly add the powdered sugar, half a cup at a time, beating continuously to incorporate air. This method ensures a fluffy texture instead of a grainy frosting. Patience here results in that light and dreamy finish.

Step 7: Adjust Consistency and Flavor

Mix in the vanilla extract and start with one tablespoon of heavy cream. Beat on high and add more cream, one tablespoon at a time, until your frosting achieves a spreadable, fluffy texture perfect for swirling.

Step 8: Divide and Color the Frosting

Separate the frosting evenly into two bowls. Add purple food coloring to one and blue to the other, folding gently until you reach the shades that excite you. These vibrant colors are the hallmark of the Unicorn Funfetti Cake Mix Bars with Colored Frosting Recipe, making them truly stand out.

Step 9: Frost and Swirl

Alternately dollop and spread purple and blue frosting across the cooled bars. Use a spoon or a flat spatula to gently swirl the colors together, creating that mesmerizing unicorn-inspired marbled effect.

Step 10: Add Sprinkles and Serve

Finish with a generous sprinkle of colorful sprinkles on top, if desired. Cut into bars, serve bright, and watch them disappear fast!

How to Serve Unicorn Funfetti Cake Mix Bars with Colored Frosting Recipe

A stack of two square cake pieces sits on a white plate on a white marbled surface. Each cake piece has two layers: a thick bottom layer of light beige cake with colorful red, blue, and green sprinkles mixed inside, and a top layer of creamy blue and light purple frosting spread thickly with visible swirls. The frosting is decorated with small round and rod-shaped multicolored sprinkles in purple, yellow, green, blue, and pink. The background is softly blurred with more cake pieces and a glass bottle with a yellow and white striped straw. A purple and white striped cloth is partially visible to the right. Photo taken with an iphone --ar 4:5 --v 7

Garnishes

Sprinkles are the classic garnish here—because who can resist extra sparkle? Consider adding edible glitter or pastel-colored sugar crystals to amplify the whimsical vibe. Fresh berries or a light dusting of powdered sugar can also add an elegant touch to your playful bars.

Side Dishes

These fun bars pair beautifully with simple sides like a creamy vanilla ice cream or a fresh fruit salad to balance the sweetness. For a party, add a glass of sparkling lemonade or a fruity punch to keep the mood cheerful and light.

Creative Ways to Present

If you want to wow your guests, serve individual bars on pastel plates with tiny unicorn figurines or colorful napkins. Display them on a tiered dessert stand to showcase their vibrant frosting layers. You could even pipe frosting rosettes on each bar with a star tip for an added decorative flair.

Make Ahead and Storage

Storing Leftovers

You can keep any leftover bars in an airtight container at room temperature for up to two days. For longer freshness, refrigerate the bars, which will keep them moist and delicious for about a week. Just be sure to cover the container tightly to prevent the frosting from drying out.

Freezing

These bars freeze beautifully. Wrap them tightly in plastic wrap and place in a freezer-safe container or bag. They will keep well for up to 3 months. When ready to enjoy, thaw them overnight in the fridge to preserve the creamy frosting texture.

Reheating

Because of the cream cheese frosting, reheating isn’t usually necessary or recommended, but if you prefer your bars slightly warm, let them come to room temperature first, then warm briefly in a low temperature oven (around 300°F) for 5-7 minutes. Avoid microwave reheating to prevent melting the frosting unevenly.

FAQs

Can I use a different cake mix flavor for this recipe?

Absolutely! While funfetti offers that classic colorful sprinkle surprise, trying vanilla or even strawberry cake mix would create a delicious variation with a different twist on this Unicorn Funfetti Cake Mix Bars with Colored Frosting Recipe.

What if I don't have cream cheese on hand?

Cream cheese is key for that tangy balance in the frosting, but you could substitute with mascarpone or a mixture of butter and a bit of sour cream for a similar texture, though the flavor will differ slightly.

How do I avoid the frosting colors from mixing and turning into a muddy shade?

When swirling your colored frostings, use gentle, deliberate motions and avoid overmixing. Alternating dollops rather than mixing fully helps keep the colors distinct and vibrant in your finished bars.

Can I make these bars vegan?

To veganize this recipe, use a dairy-free funfetti cake mix if available, replace butter with a plant-based alternative, swap the egg with a flax or chia egg, and use vegan cream cheese and non-dairy cream for the frosting. The texture will be slightly different but still enjoyable!

Is it okay to omit the sprinkles on top?

Definitely! Sprinkles add a fun pop of color, but the bars are just as delightful without them. If you want to skip sugary toppings, a dusting of powdered sugar or fresh edible flowers can also look fantastic.

Final Thoughts

I cannot recommend making the Unicorn Funfetti Cake Mix Bars with Colored Frosting Recipe enough if you want a joyful, colorful, and utterly delicious treat that’s perfect for any occasion. The ease of the cake mix combined with the creative frosting colors means you can whip up something that looks like a party and tastes even better. Go ahead, pour yourself a glass of milk and dive into a slice of magic—you deserve it!

Unicorn Funfetti Cake Mix Bars with Colored Frosting Recipe

Ingredients You'll Need