Birthday cake mix blondies are a quick, crowd-pleasing dessert that come together in minutes. Packed with sprinkles and white chocolate, these Funfetti blondies are perfect for birthdays, celebrations, or any time you want a cheerful sweet treat.
We celebrate birthdays around here no matter the age, and these blondies are my go-to when I want something festive without fuss. They have a chewy, slightly cake-like texture thanks to a few simple tweaks and the addition of heavy cream and white chocolate.
Ingredients
You’ll need the following:
- Cake mix – Funfetti or birthday cake mix. If you don’t have a confetti mix, use yellow cake mix and stir in extra sprinkles.
- Butter – melted.
- Eggs – large.
- Heavy cream – this gives the blondies a rich, homemade texture; don’t substitute with regular milk or half-and-half.
- White chocolate – chopped into pieces.
- Sprinkles – rainbow sprinkles for a festive look.
How to Make
These birthday cake batter blondies are straightforward to prepare and bake.
Preheat your oven to 350°F (175°C). Grease a 9×9-inch baking pan or line it with parchment paper for easy removal.
In a large mixing bowl, combine the cake mix, melted butter, eggs, and heavy cream. Stir just until the ingredients come together and form a thick batter.
Gently fold in the chopped white chocolate and most of the rainbow sprinkles, reserving a few to scatter on top before baking.
Spread the batter evenly into the prepared 9×9 pan.
Bake for 25–30 minutes, or until a toothpick inserted into the center comes out clean or with just a few moist crumbs. Avoid overbaking so the blondies stay chewy.
Allow the blondies to cool in the pan for at least 30 minutes before slicing into squares. Cooling helps them set so you get neat pieces.
Serve and enjoy!
Storing
Store the cooled blondies tightly wrapped at room temperature for up to 4 days. For longer storage, keep them in an airtight container in the refrigerator for up to a week; bring to room temperature before serving for best texture.
Tips and Tricks
- Add extra sprinkles on top before baking for a brighter, more festive appearance.
- If using yellow cake mix, choose sprinkles that match the occasion—seasonal colors work great.
- Mix the batter only until combined; overmixing can make the blondies dense or tough.
Other Blondie Recipes
These birthday cake mix blondies are a joyful, easy dessert to share. If you enjoyed them, try other blondie variations for different flavors and add-ins.
Make a batch for your next celebration and watch how quickly they disappear!
Birthday Cake Mix Blondies Recipe
Ingredients
- 1 box birthday cake cake mix
- 1/3 cup melted butter
- 2 large eggs
- 1/4 cup heavy cream
- 1/2 cup chopped white chocolate
- 2-3 tbsp rainbow sprinkles
Instructions
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Preheat oven to 350 F, grease or line a 9×9 baking pan and set aside
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In a large bowl, stir together the cake mix, melted butter, eggs, and heavy cream
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Fold in the chopped chocolate and rainbow sprinkles, reserving some sprinkles for the top if desired
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Spread the batter into the prepared pan and bake in preheated oven 25-30 minutes, or until a toothpick inserted into the center comes out clean
-
Allow to cool at least 30 minutes before slicing and serving
Notes
- Add extra sprinkles to the top for even more fun!
- If you plan to use yellow cake mix, you can customize the sprinkles to suit any occasion! Red and green, orange and black, etc!
- Don’t overmix the batter or the blondies will be sort of tough.