These Cake Batter Blondies are a dreamy mashup of chewy blondies and nostalgic cake batter flavor. With a golden, slightly crisp edge and a soft, fudgy center, every bite is a delightful mix of textures. The rich vanilla notes, studded with colorful sprinkles, make them as fun to eat as they are to bake. Ready in just over an hour, they’re perfect for satisfying a sweet tooth without spending all day in the kitchen.
Packed with buttery richness and a hint of sweetness, these blondies are a crowd-pleaser for any occasion. The decadent flavor and playful sprinkle-filled appearance make them irresistible, while the simple prep ensures you’ll have more time to enjoy them. Whether you’re sharing with friends or indulging solo, these treats are guaranteed to bring a smile. Plus, they’re as easy to make as they are delicious—what’s not to love?
What You’ll Need for Cake Batter Blondies
- 15.25 ounces (1 box) funfetti cake mix
- ¼ cup vegetable oil (can substitute with melted coconut oil)
- 1 large egg
- ⅓ cup milk (any type works, including non-dairy alternatives)
- ½ cup white chocolate chips
- ½ cup rainbow sprinkles (plus extra for topping)
For the Frosting:
- ¼ cup butter, softened (unsalted preferred)
- 2 Tablespoons milk (adjust for desired consistency)
- 1 teaspoon vanilla extract
- 2 cups powdered sugar (more or less for thickness)
- 4 drops red food coloring (optional, for a pink hue)
- ½ cup sprinkles (for decorating the top)
How to Make Cake Batter Blondies
- Preheat your oven to 350°F (175°C). Lightly spray a 9×9-inch glass baking pan with non-stick cooking spray.
- Combine the dry and wet ingredients: In a large bowl, mix the cake mix, vegetable oil, and egg until well combined. Slowly add the milk, stirring gently to keep the batter dense.
- Fold in the mix-ins: Gently fold in the rainbow sprinkles and white chocolate chips until evenly distributed.
- Bake: Pour the batter into the prepared pan and spread it evenly to the edges. Bake for 25-30 minutes. The blondies will be slightly soft in the center but will firm up as they cool. Let them sit for 20-30 minutes after baking.
- Cool completely: Allow the blondies to cool in the pan before frosting.
- Make the frosting: In a bowl, combine the softened butter, milk, vanilla, powdered sugar, and food coloring (if using). Mix until smooth. If the frosting is too thick, add a splash of milk; if too runny, add more powdered sugar.
- Frost and decorate: Spread the frosting evenly over the cooled blondies. Top with additional sprinkles for a festive touch.
- Serve and enjoy: Cut into squares and enjoy your delicious, colorful Cake Batter Blondies!
Fun Topping Ideas to Elevate Your Blondies
Take your Cake Batter Blondies to the next level with creative toppings! Try drizzling melted white or dark chocolate over the frosting for a decadent touch. For a fruity twist, add a handful of freeze-dried strawberries or raspberries on top. If you love texture, sprinkle crushed pretzels or toasted coconut flakes for a sweet-and-salty combo. Pro tip: Add extra sprinkles right before serving to keep them vibrant and crunchy!
How to Store and Keep Your Blondies Fresh
Store your blondies in an airtight container at room temperature for up to 3 days. For longer storage, wrap them tightly in plastic wrap and freeze for up to 2 months. When ready to enjoy, let them thaw at room temperature or pop them in the microwave for 10-15 seconds to restore that gooey texture. Note: If frosted, store in the fridge to keep the frosting firm.
Quick Recipe Variations to Mix It Up
Customize your blondies with simple swaps! Swap the white chocolate chips for dark chocolate or butterscotch chips for a richer flavor. Use a different cake mix, like chocolate or vanilla, to change the base flavor. For a nutty twist, fold in ½ cup of chopped almonds or pecans. Feeling adventurous? Add a swirl of peanut butter or caramel sauce before baking for a gooey surprise inside.
Time-Saving Tips for Busy Bakers
Short on time? Skip the frosting and dust the cooled blondies with powdered sugar for a quick, elegant finish. Use a stand mixer to combine the batter in just 2-3 minutes. If you’re baking ahead, prepare the batter the night before, cover it, and refrigerate until ready to bake. Bonus tip: Use pre-measured ingredients to streamline the process even further!
Common Questions Answered
Can I use a different pan size? Yes! For thinner blondies, use a 9×13-inch pan and reduce the baking time by 5-7 minutes. For thicker bars, stick to the 9×9-inch pan. Why are my blondies too soft? They’ll firm up as they cool, so let them sit for at least 20-30 minutes before cutting. Can I make these gluten-free? Absolutely! Just swap the cake mix for a gluten-free version and follow the same instructions.
Cake Batter Blondies Recipe
Ingredients
- 15.25 ounces funfetti cake mix, 1 box
- 1/4 cup vegetable oil
- 1 egg
- 1/3 cup milk
- 1/2 cup white chocolate chips
Frosting
- 1/4 cup butter, softened
- 2 Tablespoons milk
- 1 teaspoon vanilla
- 2 cups powdered sugar (more or less depending on how thick/runny you like it)
- 4 drops red food coloring optional
- 1/2 cup sprinkles, for the top
Instructions
- Preheat oven to 350 degrees. Spray a 9×9 inch glass pan with non-stick cooking spray.
- Combine the cake mix, oil, and egg in a large bowl.
- Add the milk to the bowl slowly, you want the batter to remain as dense as possible.
- Fold in the rainbow sprinkles and white chocolate chips.
- Pour batter in pan and spread to the edges.
- Bake for 25-30 minutes (they will be a little soft/gooey in the middle- just let them sit for about 20-30 minutes and they will set up).
- Cool completely.
- To make frosting, combine all frosting ingredients together in a bowl and frost bars.
- If frosting is too thick, add a little more milk.