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Homemade Funfetti cake bars recipe sliced on parchment paper with colorful sprinkles

Funfetti Cake Bars Recipe

Easy and colorful Funfetti cake bars recipe with rainbow sprinkles, vanilla flavor, and creamy frosting. A 15-minute prep dessert perfect for parties and celebrations.
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Prep Time 10 minutes
Cook Time 25 minutes
Cooling 10 minutes
Total Time 45 minutes
Servings: 12 bars
Course: Dessert, Snack
Cuisine: American
Calories: 290
Ingredients Equipment Method Notes

Ingredients
  

Cake Bars
  • 1 box (15.25 oz) vanilla cake mix
  • ⅓ cup vegetable oil
  • 2 large eggs
  • 1 cup water
  • ½ cup rainbow sprinkles jimmies recommended
  • ½ teaspoon vanilla extract
Frosting
  • ½ cup unsalted butter softened
  • 3 cups powdered sugar
  • ¼ cup milk
  • 1 teaspoon vanilla extract
  • ¼ cup rainbow sprinkles for topping

Equipment

  • 1 9x13 inch metal baking pan Ensures even baking and perfect bar thickness
  • 1 Parchment paper For lining the pan and easy removal of baked bars
  • 1 Large mixing bowl To mix all ingredients together easily
  • 1 Electric mixer For smooth batter and fluffy frosting
  • 1 Rubber spatula Ideal for folding in sprinkles gently
  • 1 set Measuring cups & spoons For accurate ingredient measurement
  • 1 Wire cooling rack Helps bars cool evenly without getting soggy

Method
 

  1. Preheat oven to 350°F (175°C).
  2. Line a 9x13 inch baking pan with parchment paper and grease it.
  3. In a bowl, combine cake mix, oil, eggs, and water. Beat until smooth.
  4. Fold in vanilla and sprinkles. Avoid overmixing.
  5. Pour batter into the pan and spread evenly.
  6. Bake for 22–25 minutes or until a toothpick comes out clean.
  7. Let cool completely.
  8. Beat butter until fluffy. Add powdered sugar, milk, and vanilla. Mix until smooth.
  9. Spread over cooled bars. Add more sprinkles.
  10. Slice and serve.

Notes

  • Nutrition information is automatically calculated, so should only be used as an approximation.