Cake Batter Blondies are chewy cookie bars with rich, birthday cake flavor! Top them with a sweet cake batter frosting and sprinkles for an over-the-top fun dessert.
This blondie recipe was originally published in July 2016. I updated the recipe notes and added new photos in May 2026.
Aimee’s Recipe Notes
Blondies are bars with a chewy, dense consistency that’s similar to brownies but without the chocolate. They’re usually flavored with plenty of vanilla and baked with mix-ins ranging from chocolate chips to nuts.
I even dedicated an entire chapter to blondie recipes in my cookbook!
Today’s recipe is like a yellow cake and blondies all in one!
Cake Batter Blondies are for those times when you can’t decide between cake or blondies. With rainbow sprinkles on top, they’re perfect for any kind of celebration!
I’ve even included some shortcuts for you! Enjoy.
Ingredient Notes
Scroll down to the recipe card below for the complete list of ingredients with measurements.
- Brown sugar – Best for blondies with a rich caramel flavor and golden brown color.
- Butter – Use melted butter for chewiest blondies!
- Yellow cake mix – Adds the butter-rich flavor you recognize in your favorite birthday cakes! You will use some cake mix in the blondie batter and another 2 tablespoons in the frosting.
- Pure Vanilla Extract – A good quality pure vanilla extract goes a long way in blondie recipes. I love baking with homemade vanilla extract whenever possible.
- Sprinkles – You can use nonpareils, jimmies or any other kind of colorful sprinkles you like in these cake batter blondies.
This Cake Batter Fudge has dry cake mix added in to give it a butter-rich, chewy texture. Or give our easy Cake Mix Cookies a try, they’re definitely a reader favorite!
Tips and Tricks
- Do not over mix. I prefer to mix the batter by hand for this recipe, especially after adding the dry ingredients. Over blending can make blondies tough. Fortunately, you just need one bowl!
- Line your pan with parchment paper. This makes it so much easier to remove the blondies from the pan.
- Let blondies cool before frosting. If you rush and add frosting to warm blondies you’ll have a gooey sticky mess on your hands. I speak from experience!
- You will not use a full box of cake mix. This recipe uses just over half a cup of mix. Store the leftovers in an ziploc bag to use for future baking.
- Storage. Keep blondies in an airtight container for up to one week. Or freeze for up to 3 months.
Easy Blondie Recipes
I have so many blondie recipes on this site for different cravings and occasions. It’s too hard to pick a favorite!
- These Pecan Pie Blondies are my go-to blondie bars with nuts.
- When I’m craving something extra decadent, it’s Candy Bar Blondies all the way. Or try our Easter blondies for a holiday treat.
- Nutella Blondies: chewy blondies with thick swirls of creamy Nutella!
- Maple Bacon Blondies: if you’ve never enjoyed bacon in your sweets…give this one a try! I promise it’s amazing.
- Macadamia Nut Blondies: your favorite cookie is now a chewy blondie!
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Cake Batter Blondies Recipe
Ingredients
FOR THE BLONDIES:
- 1 cup light brown sugar, packed
- ½ cup unsalted butter, melted
- 1 large egg
- 1 teaspoon pure vanilla extract
- ¼ teaspoon kosher salt
- ¾ cup all-purpose flour
- ½ cup dry yellow cake mix
- ¼ cup sprinkles
FOR THE FROSTING:
- ¼ cup unsalted butter, softened to room temperature
- 2 Tablespoons milk
- 2 cups powdered sugar
- 2 Tablespoons dry yellow cake mix
- 2 Tablespoons sprinkles
Instructions
- Preheat oven to 350°F. Line an 8-inch square baking dish with parchment paper. Set aside.
- In a large mixing bowl, combine brown sugar with melted butter. Add in egg, vanilla and salt. Mix until blended. Add in flour and cake mix, stirring JUST until combined. Fold in sprinkles.
- Pour batter into prepared baking dish. Bake for 22-25 minutes. Remove from oven and cool completely.
- While blondies are cooling, prepare the frosting. Beat butter with milk, powdered sugar, and yellow cake mix. Once smooth, spread over cooled blondies. Add sprinkles.
Notes
- Don’t overmix. Using just one bowl and a spoon, you can mix the ingredients just until combined. No electric mixer needed.
- Keep bars in an airtight container for up to a week.
- Freeze bars in a freezer safe container for up to 3 months.
Nutrition
Easy Cookie Recipes
Love birthday cake? These cake batter blondies may just be your new favorite dessert bar!
Wow this looks so delicious .
Olga.
Those look incredible and so fun! My kids would adore them.
MMM you had me at cake batter frosting!! LOVE!!
What fun blondies! These look perfectly soft and chewy!
Hahahaha! That 10 for 10 sale always gets me too! Of course I need 10 box mixes or goldfish bags!!! And of course I need more blondies in my life! Love the cake batter version!
These are so fun! I love the frosting includes the cake batter – yum all the way through!
Oh Aimee, a thousand times yes! I love anything with cake batter and sprinkles! Pinned!
These cake batter blondies look so chewy and delicious! I love all those sprinkles in them and on top, such a fun treat!
Oh YUM! These Blondies look amazing, I think I would have a difficult time stopping with one or two!
I often buy a lot I don’t need when grocery shopping too…especially when it comes to the baking aisle! These blondies look SO good! I love the cake batter flavor!
Oh my goodness, I buy EVERYTHING at the store. I always feel like I can use them whenever, and it’s such a great thing to be stocked, right? I’m not a grocery store shopping addict, right?!
These look incredible. The love is there!