Funfetti Blondies Recipe

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These Funfetti Blondies are my go-to when I want something bright, nostalgic, and unfussy. They deliver tender, buttery bars studded with colorful sprinkles that give both crunch and cheerful pockets of color. Simple ingredients, straightforward steps, and a reliably delicious result make these a kitchen win every time.

The recipe is small-batch, baked in an 8×8 pan, which means they’re perfect for a family dessert or a bake to bring to a friend. The texture is soft and slightly chewy with a lightly golden top. No complicated techniques—just basic mixing and a short bake.

Below you’ll find everything you need: a clean ingredients list (with tips), clear step-by-step instructions, troubleshooting advice, storage tips, and a few seasonal ideas to switch things up. Let’s bake.

The Essentials

Yield: One 8×8 pan (about 9–12 blondies). Prep time: 10 minutes. Bake time: 25–30 minutes. Total time: ~40 minutes including cooling.

Oven temperature: 350ºF. Use an 8×8 baking pan prepared with baking spray (or line with parchment for easier removal). The recipe uses melted, cooled butter—this keeps the batter dense and fudgy rather than cakey.

Ingredients

• 1/2 cup butter, melted and cooled — Provides the rich, buttery base and fudgy texture; cool it slightly so it doesn’t cook the egg.
• 1/2 cup packed dark brown sugar — Adds moisture and a deeper caramel flavor than light brown sugar.
• 1/4 cup granulated sugar — Balances sweetness and helps create a slight top-crackle.
• 1 large egg — Binds the batter and contributes to the tender crumb.
• 1 teaspoon vanilla extract — Enhances the overall flavor; use pure vanilla if you have it.
• 1/2 teaspoon kosher salt — Balances sweetness and enhances flavor; adjust if using table salt (about 1/4 tsp).
• 1 cup all-purpose flour — Structure for the blondies; measure by spooning into the cup and leveling.
• 1/2 teaspoon baking powder — Gives a slight lift so the bars aren’t flat and gummy.
• 1/4 cup sprinkles — For color and a bit of crunch; use shelf-stable jimmies (not nonpareils) for best texture.

Build Funfetti Blondies Recipe Step by Step

Follow these steps in order. I keep the process tidy and forgiving—no mixer required, just a bowl and a spatula.

1. Preheat your oven to 350ºF. Prepare an 8×8-inch baking pan by coating it with baking spray. Alternatively, line the pan with parchment paper, leaving an overhang on two sides for easy removal later.
2. In a medium bowl, combine 1/2 cup melted and cooled butter with 1/2 cup packed dark brown sugar and 1/4 cup granulated sugar. Whisk or stir until the sugars are fully moistened and the mixture looks glossy.
3. Add 1 large egg and 1 teaspoon vanilla extract to the butter-sugar mixture. Whisk until smooth and evenly combined.
4. Sprinkle in 1/2 teaspoon kosher salt, 1 cup all-purpose flour, and 1/2 teaspoon baking powder. Fold gently with a spatula just until the dry ingredients are incorporated—avoid overmixing to keep the blondies tender.
5. Stir in 1/4 cup sprinkles until distributed throughout the batter. Reserve a few extra sprinkles to scatter on top if you like a brighter finish.
6. Spread the batter into the prepared 8×8 pan, smoothing the top with an offset spatula or the back of a spoon so it’s even across the pan.
7. Bake in the preheated 350ºF oven for 25–30 minutes. Test for doneness by inserting a toothpick into the center; it should come out with a few moist crumbs but not wet batter. The top should be lightly golden brown.
8. Remove the pan from the oven and transfer to a cooling rack. Cool completely in the pan before cutting into squares so the blondies set and hold their shape—this usually takes at least 45–60 minutes at room temperature.
9. Once cooled, lift the blondies from the pan using the parchment overhang or run a knife around the edges and invert onto a cutting board. Cut into 9 or 12 pieces and serve.

Why It Deserves a Spot

These blondies are uncomplicated but reliably delightful. The flavor is buttery-sweet with a subtle caramel note from the dark brown sugar. The sprinkles add nostalgia and contrast in texture without being gimmicky. They’re an excellent crowd-pleaser for school events, potlucks, or an after-dinner treat.

Because the recipe is small, it’s great when you want a fresh batch without hoarding a big pan of cookies. The straightforward technique makes it accessible to novice bakers while still delivering great texture for more experienced cooks who appreciate a dependable sweet bar.

If You’re Out Of…

If you’re missing an ingredient, here are realistic swaps and notes:

• Butter — Stick with butter for flavor. If you must, use an equal amount of neutral vegetable shortening (the texture will be slightly less rich).
• Dark brown sugar — You can use light brown sugar in the same amount; the flavor will be a touch lighter but still excellent.
• Granulated sugar — Do not skip; it contributes to texture. If needed, replace with an equal amount of more brown sugar—but expect a moister, chewier bar.
• Sprinkles — Any shelf-stable jimmies work. Avoid nonpareils (tiny round sprinkles), which can bleed color when baked.

Essential Tools for Success

• 8×8-inch baking pan (metal or glass)
• Baking spray or parchment paper for easy removal
• Medium mixing bowl and spatula or wooden spoon
• Measuring cups and spoons (accurate flour measurement helps texture)
• Cooling rack
• Toothpick or cake tester to check doneness

Avoid These Mistakes

Common issues and how to prevent them:

• Overbaking — Bake until just set with moist crumbs on a toothpick. Overbaked blondies become dry.
• Hot butter — If the melted butter is too hot it can scramble the egg. Let it cool slightly before adding.
• Too much mixing — Overworking the batter develops gluten and yields a tougher texture. Fold until just combined.
• Wrong sprinkles — Nonpareils can bleed color; use jimmies or thicker sprinkles meant for baking.

Seasonal Spins

Small changes make these feel seasonal without altering the technique:

• Spring/Easter — Use pastel jimmies and add a sprinkle of lemon zest to brighten the flavor.
• Summer — Fold in 1/4 cup mini white chocolate chips for a lighter, creamier bite.
• Fall — Swap sprinkles for chopped toasted pecans and a 1/4 teaspoon ground cinnamon for warm spice.
• Winter/Holidays — Use red and green sprinkles or add a tablespoon of crushed peppermint after baking for a festive crunch.

Behind-the-Scenes Notes

I developed this small-batch recipe to be flexible and quick. The balance of granulated and dark brown sugars gives the blondies both browning and chew. Cooling completely is a step many skip, but it’s key—cutting too early yields ragged squares that crumble.

If you bake often, keep a jar of shelf-stable sprinkles labeled “funfetti” so you can throw these together on short notice. The recipe scales reasonably—double it for a 9×13 pan, but reduce bake time slightly if using a shallower pan; check early.

Prep Ahead & Store

Make-ahead: You can bake these up to 2 days ahead and store them at room temperature. Wrap tightly or keep in an airtight container to prevent drying out. For longer storage, freeze individual squares in a single layer on a sheet pan until solid, then transfer to a freezer-safe bag for up to 2 months. Thaw at room temperature when ready to serve.

To refresh: If they’ve firmed in the fridge, bring to room temperature before serving or warm gently for 8–10 seconds in the microwave to regain softness.

FAQ

Q: Can I use salted butter? A: Yes, but reduce the added salt to about 1/4 teaspoon to avoid over-salting.

Q: Why did my sprinkles bleed color? A: Tiny nonpareil sprinkles often bleed when heated. Use stable jimmies for baking.

Q: Can I add mix-ins like chocolate chips? A: Yes—up to 1/2 cup of chips or nuts can be folded in, though the original recipe keeps it simple with sprinkles only.

Q: How do I know when they’re done? A: Look for a lightly golden top and a toothpick with moist crumbs—not wet batter. They will continue to set as they cool.

Wrap-Up

These Funfetti Blondies are an easy, reliable treat that brings bright cheer to any occasion. With a small ingredient list and straightforward steps, they’re perfect for busy bakers or anyone craving a sweet, buttery bar. Keep the technique simple, watch your bake time, cool completely, and enjoy the happy colors—and compliments—that follow.

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