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Fireworks Blondies

Fireworks blondies are thick, chewy golden bars baked with red, white, and blue star sprinkles and M&Ms baked right in for colorful bursts. This easy blondie recipe features a glossy batter, a lightly set center, and a crinkly golden top.
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Prep Time 15 minutes
Cook Time 25 minutes
Total Time 40 minutes
Servings: 16 servings
Course: Dessert
Cuisine: American
Calories: 310
Ingredients Equipment Method Notes

Ingredients
  

Wet ingredients
  • 0.5 cup unsalted butter melted
  • 1 cup brown sugar packed
  • 1 egg large
  • 1 egg yolk
  • 2 tsp vanilla extract
Dry ingredients
  • 1 cup all-purpose flour
  • 0.5 tsp baking powder
  • 0.25 tsp salt
Mix-ins
  • 0.5 cup M&Ms red, white, and blue
  • 0.33 cup star sprinkles red and blue, plus extra for topping
  • 0.25 cup white chocolate chips

Equipment

  • 1 sheet pan

Method
 

Prep the pan and preheat
  1. Preheat the oven to 350°F and line an 8x8 baking pan with parchment paper, leaving overhang for easy lifting after baking.
Mix the wet base
  1. Whisk melted butter and brown sugar together until smooth, then add the egg, egg yolk, and vanilla and whisk until glossy.
Add dry ingredients (don’t overmix)
  1. Stir in the flour, baking powder, and salt until just combined—stop as soon as no dry streaks remain.
Fold in the add-ins
  1. Fold in the M&Ms, star sprinkles, and white chocolate chips until evenly distributed through the batter.
Bake
  1. Spread the batter evenly into the prepared pan, scatter extra sprinkles on top, and bake for 22–25 minutes until the top is golden and set with a very slight jiggle in the center.
Cool and cut
  1. Cool completely in the pan before cutting into squares, so the blondies firm up as they cool.

Notes

For the chewy center, pull the pan when the middle still jiggles slightly—overbaking makes blondies cakier. Store covered at room temperature for up to 3 days or refrigerate for up to 5 days; freeze up to 2 months (cut squares first for easier thawing). For a lighter option, use reduced-fat butter sticks and expect a slightly softer texture.