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Introduction

If you’ve been searching for the ultimate funfetti blondie recipe, your quest ends here. These blondies hit all the right notes: soft yet thick, perfectly chewy, and loaded with vibrant rainbow sprinkles that add a festive pop of color in every bite. The addition of rich white chocolate chips melts into pockets of creamy sweetness, elevating these blondies from ordinary to extraordinary.

What makes this recipe truly special is how effortless it is—everything comes together in one bowl, no electric mixer needed. That means less cleanup and more time to enjoy this easy funfetti dessert. Whether you’re a seasoned baker or just starting out, this recipe delivers thick blondies with sprinkles that hold their shape and flavor, making it the perfect treat for birthdays, celebrations, or whenever you want a homemade dose of happiness.

Why I Love These Funfetti Blondies

Thick & Chewy Texture: The perfect balance of soft and chewy, these blondies aren’t cakey or dry. They have that dense, fudgy bite you want.
One Bowl, No Mixer Needed: Mix by hand for the best texture—no fuss, no cleanup.
Made in a 9×13 Pan: Unlike many recipes that make smaller batches or thin bars, this one uses a 9×13 blondie pan recipe for thick blondies with sprinkles that satisfy every sweet tooth.

Ingredient Notes & Tips

White Chocolate Chips

Always opt for higher-quality white chocolate chips. They melt better and give a smoother, creamier bite. Cheap chips can taste waxy and won’t blend into the blondie as nicely.

Sprinkles

Use jimmies sprinkles, not the pearl or nonpareil types. Jimmies keep their shape better in the oven and give you those classic, colorful dots without turning into blobs of color.

Baking & Mixing

Don’t Overbake: The key to chewy funfetti blondies is to pull them out just as the edges set and the center looks slightly underbaked.
Mix by Hand: Stirring by hand keeps these chewy blondie bars dense and tender. Overmixing with a mixer can introduce too much air and make them cakier.

Ingredients List & Why They Matter

1 cup unsalted butter (melted): Butter is the foundation here, providing richness and moisture. Using unsalted butter lets you control the salt level precisely. Melting it helps create that dense, chewy texture we want for thick blondies with sprinkles.
1 cup light brown sugar (packed): Brown sugar adds moisture and a subtle caramel flavor thanks to its molasses content. It also helps keep the blondies chewy and tender.
1/2 cup granulated sugar: Balances the brown sugar’s moisture with a bit of sweetness and helps with browning on the edges for that perfect golden crust.
2 large eggs: Eggs bind the batter together and add richness. Using large eggs ensures the right balance of moisture and structure.
2 teaspoons vanilla extract: This is the secret weapon for flavor depth. Pure vanilla extract enhances the sweet, buttery notes and complements the white chocolate chips beautifully.
1/2 teaspoon salt: Salt is essential to balance sweetness and enhance all the flavors. Since you’re using unsalted butter, this pinch of salt is crucial.
1 teaspoon baking powder: A leavening agent that gives just enough lift to keep your blondies from becoming too dense, but not cakey. It helps create that soft and chewy texture.
1 tablespoon cornstarch: Cornstarch tenderizes the blondies by softening the gluten in the flour, contributing to a chewy, almost fudgy bite rather than a tough one.
1 3/4 cups all-purpose flour: The structure builder. This amount balances density with tenderness perfectly. Too much flour makes them dry; too little, and they won’t hold together well.
1 cup white chocolate chips: White chocolate adds creamy sweetness and melts slightly for pockets of gooey richness. Use high-quality chips for the best melt and flavor.
3/4 cup rainbow sprinkles (jimmies style): Adds fun bursts of color and a bit of crunch without melting into the batter. Jimmies hold up best during baking compared to other sprinkle types.

Key ingredients for funfetti blondies including eggs, white chocolate chunks, flour, chocolate chips, and colorful sprinkles on a wooden surface. — Essential ingredients for making thick and chewy funfetti blondies, featuring white chocolate chunks, eggs, flour, chocolate chips, and festive sprinkles.

Instructions / Method: Step-by-Step Guide to Perfect Funfetti Blondies

Step 1: Preheat & Prepare Your Pan

Preheat your oven to 350°F (175°C). This ensures even baking right from the start. Lightly grease a 9×13-inch blondie pan or line it with parchment paper, making sure to leave an overhang on two sides. This overhang is your secret weapon for easy removal—no fighting with the pan when you want to slice those chewy blondie bars.

Step 2: Melt Butter & Combine Sugars

Melt the unsalted butter in a microwave-safe bowl or on the stovetop until fully liquid but not hot enough to cook the eggs later. Let it cool slightly to avoid scrambling the eggs. In a large mixing bowl, whisk the melted butter together with the light brown sugar and granulated sugar until the mixture is smooth and glossy. This helps dissolve the sugar for a better texture.

Step 3: Add Eggs, Vanilla & Leavening Agents

Add the eggs one at a time, whisking thoroughly after each addition to create a smooth, creamy batter. This gradual mixing ensures even distribution, which is key for the chewy texture. Next, stir in the vanilla extract, baking powder, and salt. The baking powder will give your blondies just enough lift, while salt balances the sweetness perfectly.

Step 4: Incorporate Dry Ingredients & Mix-ins

Sift together the cornstarch and all-purpose flour to remove lumps and ensure an even distribution of the cornstarch, which tenderizes the blondies. Gently fold the flour mixture into the wet batter using a spatula—don’t overmix! Overworking the batter develops gluten and makes blondies cakier, which we want to avoid. Finally, fold in the white chocolate chips and rainbow sprinkles, saving a small handful of sprinkles to scatter on top before baking for an extra colorful finish.

Funfetti blondie batter in a glass bowl with colorful jimmies sprinkles and a whisk mixing the smooth, creamy mixture. — Smooth and creamy funfetti blondie batter mixed by hand, dotted with colorful sprinkles ready for baking.

Step 5: Bake, Cool & Slice

Spread the batter evenly in the prepared pan, smoothing the top with a spatula. Sprinkle the reserved sprinkles over the surface for a festive look. Bake for 28 to 32 minutes. You’re looking for edges that are set and golden but a center that’s just slightly jiggly—this ensures soft and chewy blondies. Resist the urge to overbake! Once out of the oven, cool completely in the pan. Use the parchment overhang to lift the blondies out for easy slicing into perfect chewy blondie bars.

Baked funfetti blondies in a parchment-lined pan, cut into thick squares with colorful sprinkles and chocolate chips on top. — Thick and chewy funfetti blondies freshly baked and cut into squares, topped with rainbow sprinkles and chocolate chips.

Additional Tips (Repeated Notes)

Remember: the better the white chocolate chip, the creamier your bars will be.
Stick to jimmies sprinkles to avoid weird colors melting into your blondies.
Don’t rush cooling—this helps the blondies set perfectly for that soft and chewy texture.

Benefits of These Funfetti Blondies

Benefit	Why It Matters
Thick & Chewy Texture	Offers a satisfying, dense bite—better than cakey blondies.
One Bowl, No Mixer	Minimizes cleanup and makes the recipe super easy, even for beginners.
Made in a 9×13 Pan	Yields large, thick bars that are perfect for sharing or meal prep.
Loaded with White Chocolate Chips	Adds creamy sweetness and gooey pockets in every bite.
Rainbow Sprinkles (Jimmies)	Keeps sprinkles colorful and intact through baking for a fun look and crunch.
Quick & Easy	Ready in under an hour, making it perfect for last-minute desserts.
Customizable	Easily adapted by swapping sprinkles or adding nuts, dried fruit, or other mix-ins.

Nutrition Information (Per Serving)

Nutrient	Amount
Calories	280
Carbohydrates	35g
Protein	3g
Fat	14g
Saturated Fat	8g
Sugar	22g
Fiber	1g
Sodium	150mg

Feel free to bookmark this one bowl blondie recipe and impress friends and family with the best funfetti blondies around. Whether you call them funfetti cookie bars or sprinkles blondie bars, these chewy blondie bars bring joy to every bite. Now, go bake and enjoy!

Conclusion

There you have it—the ultimate funfetti blondie recipe that’s thick, chewy, and bursting with colorful sprinkles and creamy white chocolate chips. This easy one bowl blondie recipe is perfect for any occasion, whether it’s a birthday, a casual dessert, or just because you want to treat yourself. The secret is in the simple ingredients and the careful baking that keeps these blondies soft and chewy every time.

If you try this recipe, I’d love to hear how your rainbow sprinkle blondies turned out—don’t forget to leave a review and rating! And if you’re looking to round out your dessert table or try something a little different, check out my recipe for passion fruit bars an elegant, tangy entrée that pairs beautifully with these sweet blondies.

For even more delicious ideas and inspiration, be sure to visit my Pinterest page where I share plenty of funfetti cookie bars, easy funfetti desserts, and other sweet treats you’ll love.

Happy baking, and remember: these are the funfetti blondies you’ll want to make again and again!

The Best Thick & Chewy Funfetti Blondies Recipe You’ll Ever Try