Bright and Colorful Dessert Bars for Every Celebration

These Rainbow Sprinkle Cake Bars are bursting with color and flavor! Soft vanilla cake layers are swirled with vibrant hues, topped with a sweet purple glaze, and finished with rainbow candy sprinkles. A true showstopper for birthdays, parties, or anytime you want a dessert that makes people smile.

Ingredients

1 box vanilla cake mix (plus eggs, oil, and water per package)
Food coloring (pink, blue, green, purple)
1 cup candy-coated chocolate pieces (mini)
1 ½ cups powdered sugar
2 tbsp milk
1 drop purple food coloring (for glaze)
Rainbow sprinkles, for topping

Instructions

Prepare cake mix as directed. Divide batter into bowls and tint with food coloring.
Drop spoonfuls of colored batter into a greased 9×13 pan. Swirl gently.
Fold in mini candy-coated chocolates.
Bake at 350°F (175°C) for 25–30 minutes. Cool completely.
Mix powdered sugar, milk, and purple food coloring for glaze. Spread over cooled bars.
Top with sprinkles. Slice and serve.

Notes

Swap candy sprinkles for holiday colors.
Store airtight at room temperature for up to 3 days.

FAQs

Can I make these with homemade cake batter? Yes, use your favorite vanilla base.
Can I use natural food coloring? Yes, plant-based colors work.
Do they freeze well? Yes, up to 2 months.
What’s the texture? Soft, moist cake with crunchy sprinkles.
Can I make them gluten-free? Yes, with GF cake mix.
Do kids love these? Absolutely, they’re bright and fun.
Can I make cupcakes instead? Yes, same batter works for cupcakes.
Can I reduce the sugar? Use less glaze or skip it.
Are they messy to cut? Use a sharp knife after chilling.
What occasions are best? Birthdays, Pride parties, baby showers.

Conclusion

Rainbow Sprinkle Cake Bars are as fun to make as they are to eat. With their colorful swirls and sweet glaze, they bring joy to any dessert table.

Rainbow Sprinkle Cake Bars

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Rainbow Sprinkle Cake Bars are soft, buttery dessert bars packed with colorful sprinkles and a rich vanilla flavor—perfect for parties, birthdays, or just a cheerful treat any day.

Author: Emma Harper
Prep Time: 10 minutes
Cook Time: 28 minutes
Total Time: 38 minutes
Yield: 16 bars 1x
Category: Dessert
Method: Baking
Cuisine: American
Diet: Vegetarian

Ingredients

Scale

1/2 cup (113g) unsalted butter, melted
1 cup (200g) granulated sugar
2 large eggs
1 tbsp vanilla extract
1 1/4 cups (156g) all-purpose flour
1/2 tsp baking powder
1/4 tsp salt
1/2 cup rainbow sprinkles (plus extra for topping)

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Instructions

Preheat oven to 350°F (175°C). Line an 8×8-inch baking pan with parchment paper or grease lightly.
In a large bowl, whisk together melted butter and sugar until combined.
Add eggs and vanilla extract, mixing until smooth.
In a separate bowl, whisk together flour, baking powder, and salt.
Gradually add the dry ingredients to the wet ingredients and mix until just combined.
Fold in the rainbow sprinkles.
Spread the batter evenly into the prepared pan and top with extra sprinkles.
Bake for 25–28 minutes, or until the edges are lightly golden and a toothpick inserted in the center comes out clean.
Let cool completely in the pan before slicing into bars.