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Fireworks Blondies

Fireworks blondies are thick, chewy American blondies loaded with red, white, and blue star sprinkles and M&Ms baked right into every square. The tops bake up golden and set while the center stays slightly jiggly for that classic chewy blondie texture.
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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 large egg Plus 1 egg yolk
  • 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 red, white, and blue M&Ms
  • 0.3333333333 cup red and blue star sprinkles Plus extra for topping
  • 0.25 cup white chocolate chips

Equipment

  • 1 sheet pan

Method
 

Prep the pan and preheat
  1. Preheat oven to 350°F and line an 8x8 baking pan with parchment paper.
Mix the batter
  1. Whisk melted butter and brown sugar together until smooth.
  2. Add the large egg, egg yolk, and vanilla extract, then whisk until glossy.
  3. Stir in all-purpose flour, baking powder, and salt until just combined—do not overmix.
  4. Fold in red, white, and blue M&Ms, red and blue star sprinkles, and white chocolate chips until evenly distributed.
Bake
  1. Spread batter evenly into the prepared pan and scatter extra red and blue star sprinkles on top.
  2. Bake for 22–25 minutes at 350°F until the top is golden and set but the center still has a very slight jiggle, with a crinkly-looking top surface.
Cool and cut
  1. Cool completely in the pan before cutting into squares, since the blondies firm up as they cool.

Notes

For clean squares, cool the blondies fully in the pan before lifting with the parchment. Store covered at room temperature up to 3 days or refrigerate up to 5 days; freeze baked squares for up to 2 months. For a gluten-free option, swap in a 1:1 gluten-free all-purpose flour blend and keep an eye on doneness during baking.