Cookies & Cups > Recipes > Dessert > Brownies and Blondies > Cake Batter Blondies with Marshmallow Buttercream

Cake Batter Blondies with Marshmallow Buttercream

Cake Batter Blondies are chewy, sweet, loaded with sprinkles, and topped with marshmallow buttercream! They start with a cake mix, with a few added ingredients including marshmallows to up the chewy factor! The prettiest blondies you will ever make!

Top these blondies off with my sweet Party Frosting aka Marshmallow Buttercream!

Cake Batter Blondies are the Perfect Party Dessert!

I made these Cake Batter Blondies way back in 2011, but thought they might need a little facelift! I snapped a few new pictures and thought that I’d bring these beauties back up to the top of your newsfeed again!

What’s not to love about a sprinkle filled, buttery bar topped with fluffy marshmallow buttercream frosting? If you’re looking for a party party treat, this is the easy dessert recipe for you!

It All Starts With A Cake Mix!

The beauty of these blondies is they start with a cake mix! I used Funfetti, because SPRINKLES! But you can certainly use any flavor that you would like. If you’re going for that true “cake batter” flavor, I do recommend that you use any version of vanilla.

Starting with a cake mix is definitely a short-cut. You use the dry cake mix as an ingredient, so don’t prepare the cake according to the package directions. Use it as you would any other dry ingredient.

Add Marshmallows!

Adding marshmallows into the batter makes these blondies extra chewy! It’s a pretty simple ingredient to add that really amps up the chewy factor. They kind of melt into the batter as it bakes, like a secret sweet ingredient.

How To Make Cake Batter Blondies

Ingredients For Cake Batter Blondies…

  • 1 box vanilla cake mix. I used Funfetti, but you can get creative with other flavors!
  • Vegetable oil
  • Egg
  • Milk
  • White chocolate chips. If you use a chocolate cake mix you can use chocolate chips instead! Or if white chocolate isn’t your thing you can leave them out!
  • Mini marshmallows to add extra chewiness
Cake Batter Blondies without frosting

Add Frosting…Or Don’t…

If frosting isn’t your thing, you can absolutely leave it off! I made some without and added some extra sprinkles on top instead.

These blondies are very sweet already, so leaving it off is fine, although I am always up for adding frosting when I can.

I do like to press sprinkles into the top, though, as the batter is a bit thick and the tops of these blondies can be a bit lumpy and not as pretty when baked.

Looking For Other Cake Mix Recipes? Try These:


clock clock iconcutlery cutlery iconflag flag iconfolder folder iconinstagram instagram iconpinterest pinterest iconfacebook facebook iconprint print iconsquares squares iconheart heart iconheart solid heart solid icon
Cake Batter Blondies without frosting

Cake Batter Blondies

5 Stars 4 Stars 3 Stars 2 Stars 1 Star No reviews
  • Author: Shelly
  • Prep Time: 10 minutes
  • Cook Time: 25 minutes
  • Total Time: 35 minutes
  • Yield: 16 1x
  • Category: Cake Mix Recipe
  • Method: Oven
  • Cuisine: Dessert


These blondies are the ultimate sweet treat! Loaded with sprinkles and topped with marshmallow frosting, these Cake Batter Blondies are a party treat!


  • 1 box vanilla cake mix (I used Funfetti)
  • 1/4 cup vegetable oil
  • 1 egg
  • 1/2 cup milk
  • 1/2 cup white chocolate chips
  • 1/2 cup mini marshmallows


  1. Preheat oven to 350°F. Coat a 9×9 baking dish with nonstick spray. Set aside.
  2. In the bowl of your stand mixer fitted with the paddle attachment combine the dry cake mix, vegetable oil, egg and milk. Mix on medium low speed until the ingredients are just combined. Batter will be dense.
  3. Stir in your chips and marshmallows until distributed evenly.
  4. Spread into your prepared pan.
  5. Bake for 25 minutes until center is just set.
  6. Allow to cool completely before frosting.


Top this with my Marshmallow Buttercream (aka Perfect Party Frosting). Cut the recipe in half for the perfect amount for these blondies!

Store airtight at room temperature for 3 days.

Nutrition information is for unfrosted blondies.


  • Serving Size:
  • Calories: 181
  • Sugar: 16.2 g
  • Sodium: 194.3 mg
  • Fat: 7.6 g
  • Carbohydrates: 26.7 g
  • Protein: 2 g
  • Cholesterol: 12.9 mg

Want To Save This Recipe?

Find more recipes like this:





PIN for later:

Cake Batter Blondies Pinterest Image

Rate this recipe and share a comment

Your email address will not be published. Required fields are marked *

Recipe rating 5 Stars 4 Stars 3 Stars 2 Stars 1 Star

I accept the Privacy Policy

84 comments on “Cake Batter Blondies with Marshmallow Buttercream”

Scroll to Top