Funfetti Brookie Bars

A colorful, sprinkle-stuffed twist on brookies that’s part brownie, part sugar cookie, and all fun.

Funfetti Brookie Bars are the ultimate dessert mashup—chewy brownies meet sprinkle-loaded sugar cookie dough in one colorful bite. Made with a boxed brownie mix and a sugar cookie base, this recipe keeps things simple but delivers major fun. From birthday parties to rainy-day baking, Funfetti Brookie Bars are always a hit.

Why You’ll Love This Recipe

• Gooey brownies and chewy sugar cookies in one bite.
• Loaded with rainbow sprinkles for a pop of color and fun.
• Easy to make using boxed brownie mix and cookie dough.
• Perfect for birthdays, bake sales, or anytime you’re craving something sweet.
• Customizable with your favorite sprinkles or seasonal twists.
• Funfetti Brookie Bars are a hit with kids and adults alike.

Ingredient Notes

• Brownie Mix: Use a standard 18–19 oz box like Ghirardelli or Betty Crocker. Choose a fudgy version for the best texture contrast with the cookie dough.
• Sugar Cookie Mix: A 17.5 oz pouch such as Betty Crocker works great. Prepare it exactly as instructed on the package before adding sprinkles.
• Rainbow Sprinkles: Use jimmies (not nonpareils) so the colors don’t bleed. Feel free to swap in holiday or themed sprinkles to fit the occasion.
• Pan Size: A 9-inch square pan gives you a perfectly thick brookie bar. Grease well or line with parchment for easy removal.

Before You Bake

Do I need to prepare both mixes separately?
Yes—make the brownie mix and sugar cookie dough separately, following each package’s directions before combining them in the pan.

Can I use a different size pan?
A 9-inch square pan gives the best thick, even bake. You can use an 8-inch for thicker bars (add more time) or a 9×13-inch for thinner bars (reduce baking time slightly).

Will the sugar cookie dough sink into the brownies?
It may swirl slightly as it bakes, but that’s part of the charm. Gently pressing the cookie dough on top helps it hold shape.

Print

FAQ

Can I use homemade brownie or cookie dough instead of boxed?
Yes, just make sure both have a similar consistency to boxed mixes so they bake evenly.

How do I know when it’s done baking?
The edges should be golden and set, and the center should no longer jiggle. A toothpick may come out slightly fudgy—don’t overbake.

Can I make this ahead of time?
Yes! Chill overnight for a chewier texture or freeze the bars for up to 2 months.

How should I store leftovers?
Store in an airtight container at room temperature for 3–4 days or in the fridge for up to a week.

Can I double the recipe?
Absolutely. Use a 9×13-inch pan and keep an eye on the baking time—expect a few extra minutes.

Sprinkle of Fun

Put on your favorite HGTV redecorating show, grab a notebook, and start sketching out your next home makeover while enjoying a square (or two) of these Funfetti Brookie Bars with a big glass of milk. Just one rule—no taking inspo from Decorating Cents. EEK!