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Cake Mix Blondies

4.67
/5
35 mins
6 Comments
Jump to Recipe Video
By: Rachel GurkPosted: 11/05/2021Updated: 02/28/2022

This post may contain affiliate links. Please read my disclosure policy.

Blondies with a text overlay that reads "easy cake mix blondies"
Blondies with a text overlay that reads "easy cake mix blondies"
Blondies with a text overlay that reads "easy cake mix blondies"
Blondies with a text overlay that reads "cake mix blondies - so easy!"

These deliciously sweet blondies are made with a doctored-up cake mix and loaded with sprinkles. A perfect treat that’s fun for a party or a special lunchbox goodie!

Recipe Overview

Why you’ll love it: These blondies are super easy to make.

How long it takes: 5 minutes to prep, 25-30 minutes to bake.
Equipment you’ll need: mixing bowl, 9×9 inch baking pan, oven
Servings: 9

Overhead view of cut blondies with sprinkles.
Table of Contents
open
  • 1 Recipe Overview
  • 2 About these Cake Mix Blondies
  • 3 About Cake Mixes
  • 4 What you’ll need
  • 5 How to make This Recipe
  • 6 FAQs
  • 7 Make It Your Own
  • 8 Make Ahead Ideas
  • 9 Storage Suggestions
  • 10 Leftover Love
  • 11 Easy Bar Recipes
  • 12 Get the Recipe: Cake Mix Blondies

We are blondie fans at my house so I knew these would be a hit the first time I made them. How can you go wrong? Festive sweet blondies with lots of rainbow sprinkles will bring a smile to anyone’s face. You don’t have to be a unicorn fan to love these treats.

An aside: Do you have a little girl in your family who just loves unicorns? My niece is all about everything unicorn. She even dressed as the most adorable unicorn for Halloween. Too cute! Her favorite song for awhile was “Rainbows and Unicorns”! It’s a cute song but a total earworm — gets stuck in your head for hours. And yes, she loves these rainbow sprinkle blondies.

Do you know someone who could use a rainbow in their life right now? Make them a batch of these easy blondies. Or better yet, invite them to your house for a cup of coffee and a blondie. Send them home with a plate of blondies and a smile.

Cut blondies on a wooden cutting board.

About these Cake Mix Blondies

These bars are seriously so easy to make! You can whip them up in five minutes. Since a cake mix is the base of the recipe, you just need to add a few things to the bowl, stir everything up and pop them into the oven.

While I generally prefer making my baked goods from scratch, sometimes using a shortcut like a boxed cake mix is a life-saver. Who doesn’t have days when you just don’t have much time to bake but there’s guests coming over or the kids need a treat. A couple more quickie recipes that I fall back on are trail mix cookies, made with refrigerated cookie dough and a few add-ins, and peanut butter cookie bars, with only 5 ingredients.

I’ll run through the recipe here (that will take about 2 seconds!). Look for the printable recipe card with complete directions and nutrition information at the end of the post.

About Cake Mixes

There are so many types of cake mixes available. It can be a bit overwhelming. Choose the cake mix brand that you like.

For this recipe, we found that a regular yellow cake mix works best. A white cake mix does not yield the same results.

Overhead view of ingredients needed for recipe including cake mix.

What you’ll need

  • Yellow Cake Mix: Select a 15 oz. box of cake mix, not one of the smaller sized boxes like Jiffy. Just plain yellow cake mix is best.
  • Vegetable Oil, Milk, Egg: Normal cake mix stuff, but you’ll use much less for these bars than for cake.
  • Pure Vanilla Extract: Vanilla adds lots of flavor to these blondies.
  • Rainbow/Confetti Sprinkles: For lots of fun and color!

How to make This Recipe

Okay, this is how it goes. Get your oven preheating and your pan ready.

Get a medium sized bowl out. Open the cake mix and empty it into the bowl.

Add the oil, milk, egg, and vanilla. Still with me? Mix everything up with a spoon. The mixture will be pretty stiff and not runny like cake batter.

Blondie batter in a metal bowl.

Mix in the sprinkles.

Unbaked spinkle blondie batter.

Spread the mixture in the pan. If you want, sprinkle more rainbow sprinkles on top of the batter.

Unbaked blondies in a bright blue square baking dish.

Bake and cool completely (if you can wait that long) and cut into squares. Enjoy with a glass of cold milk or a cup of steaming coffee.

Baked blondies in a bright blue baking dish.

FAQs

What is the difference between a brownie and a blondie?

It’s a matter of chocolate. They are both bars but brownies are made with chocolate. Blondies are vanilla flavored.
If you’re into blondies, try this easy Blondie Recipe (from scratch). Blondies are perfect for add-ins like these Raspberry White Chocolate Blondies, Chocolate Chip Blondies, or Peanut Butter Cup Blondies Recipe.
More into brownies? Try these Mocha Brownies, Kahlua Brownies with Cinnamon, or Cream Cheese Filled Brownies.

What’s the difference between a blondie and a cake?

A blondie is a bar, much denser and more chewy in texture than cake.

Make It Your Own

  • Select whatever color of sprinkle you want to celebrate any occasion. Red and green for Christmas, pastel for Easter, bright green for St. Patrick’s Day, pink or red for Valentine’s Day, school colors for game day, etc.
  • Like chocolate? Substitute mini chocolate chips for the sprinkles. Increase the amount to 1/2 cup.
  • For an extra sweet treat, frost the blondies and add even more sprinkles to the frosting.
Three cake mix blondies with sprinkles stacked on top of each other.

Make Ahead Ideas

For easy lunchbox treats, make a batch of these blondies and freeze in individual resealable bags, all set to pop into lunches. They thaw quickly so they’ll be ready to eat by lunchtime.

Storage Suggestions

These festive bars store really well. After they’ve completely cooled, cut them into squares and arrange them in an airtight container, with waxed paper or parchment between layers. They’ll keep on the counter up to three days, in the fridge for a week, or in the freezer for three months.

Leftover Love

What to do with leftover blondies? Hmmmm, let me think. Is there such a thing? Probably not.

Easy Bar Recipes

Oh Henry Bars – with nut-free option

The Best Rice Krispies Treats

Easy Snickerdoodle Bars Recipe

Red Velvet Gooey Butter Bars

Browse All

Did you make this? Be sure to leave a review below and tag me @rachelcooksblog on Facebook, Instagram, or Pinterest!

Close up of cut cake mix blondie with sprinkles.
Recipe

Get the Recipe: Cake Mix Blondies

4.67 from 15 votes
Prep Time: 5 mins
Cook Time: 30 mins
Total Time: 35 mins
9 servings
Print Rate Recipe
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These deliciously sweet blondies are made with a doctored-up cake mix and loaded with sprinkles. A perfect treat that’s fun for a party or a special lunchbox goodie.

Ingredients

  • 1 box (15 oz.) yellow cake mix
  • ¼ cup vegetable oil
  • 3 tablespoons whole milk
  • 1 large egg
  • 1 tablespoon pure vanilla extract
  • 1/4 cup rainbow sprinkles, plus more to top if desired

Instructions

  • Preheat oven to 350°F and grease a 9×9-inch baking pan or line it with parchment paper and set aside.
  • Mix together cake mix, vegetable oil, milk, egg, and vanilla extract. The batter should be well mixed but it will be stiff.
  • Transfer batter to the prepared baking pan and spread evenly with a rubber spatula. If desired, spread more sprinkles on top of batter.
  • Bake for 25-30 minutes, or until a toothpick inserted in the center comes out clean. Cool completely before cutting blondies into 9 squares.

Notes

  • For best results, use yellow cake mix. Funfetti or white cake mixes result in drier blondies.
  • If using an 8×8 -inch pan, bake blondies 30-35 minutes.
  • Feel free to substitute different sprinkle colors, depending on the occasion. Mini chocolate chips can be substituted as well (1/2 cup).
  • Bars will keep on the counter in a tightly covered container for 3 days, or a week in the fridge, or 3 months in the freezer.

Nutrition Information

Serving: 1blondie, Calories: 297kcal, Carbohydrates: 52g, Protein: 3g, Fat: 9g, Saturated Fat: 6g, Polyunsaturated Fat: 1g, Monounsaturated Fat: 1g, Trans Fat: 1g, Cholesterol: 19mg, Sodium: 427mg, Potassium: 42mg, Fiber: 1g, Sugar: 29g, Vitamin A: 35IU, Calcium: 130mg, Iron: 1mg

This website provides approximate nutrition information for convenience and as a courtesy only. Nutrition data is gathered primarily from the USDA Food Composition Database, whenever available, or otherwise other online calculators.

© Author: Rachel Gurk
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  1. Katie Dilts says

    March 15, 2023 at 9:47 am

    I’m hoping to make this recipe for a grown-up party tonight, but I want to use pecans and dried cranberries. Does not using sprinkles mean I need to add more sugar?
    Thank you for the recipe; I don’t have time to work it out for myself!

    Reply
    • Rachel Gurk says

      March 15, 2023 at 9:49 am

      You won’t need to add more sugar, but my concern is that it would be too many add-ins and they might be too dry or fall apart? But let me know if you give it a try!

      Reply
  2. Debbie says

    February 21, 2023 at 10:57 pm

    Blonde Brownies Question…

    I want to make in a 9×13 pan. With my crew I’d never get them out of a9x9 pan before they were devoured by my adult children! Lol.
    Maybe double the recipe? How much added cookie time?

    Could they also be made in a mini muffin pan?

    Thank you for your great recipes!

    Reply
    • Rachel Gurk says

      February 24, 2023 at 6:50 am

      I haven’t tested them either of these ways, but it should work if you just adjust the cooking time. Let me know how they turn out!

      Reply
  3. Dannette Campbell says

    July 22, 2022 at 6:54 am

    5 stars
    Great recipe for Blonde Brownies

    Reply
    • Rachel Gurk says

      July 25, 2022 at 3:19 pm

      Glad you liked them!

      Reply

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