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Fireworks Blondies

Fireworks blondies are thick, chewy, golden squares packed with red, white, and blue star sprinkles and M&Ms baked right in. Baked at 350°F until the tops are golden with a lightly jiggly center, then cooled completely for neat, chewy slices.
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Prep Time 15 minutes
Cook Time 25 minutes
Total Time 40 minutes
Servings: 16 servings
Course: Dessert
Cuisine: American
Calories: 270
Ingredients Equipment Method Notes

Ingredients
  

butter
  • 0.5 cup unsalted butter melted
brown sugar
  • 1 cup brown sugar packed
eggs
  • 1 large egg plus 1 egg yolk
  • 1 egg yolk
vanilla
  • 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
  • 0.33 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 oven
  1. Preheat oven to 350°F and line an 8x8 baking pan with parchment paper.
Make the blondie batter
  1. Whisk melted butter and brown sugar together until smooth.
  2. Add the egg, egg yolk, and vanilla extract, then whisk until the mixture looks glossy.
  3. Stir in all-purpose flour, baking powder, and salt until just combined, then stop mixing as soon as no dry streaks remain.
  4. Fold in the red, white, and blue M&Ms, red and blue star sprinkles, and white chocolate chips until evenly distributed.
Bake
  1. Spread the batter evenly into the prepared pan and scatter extra 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.
Cool and cut
  1. Cool completely in the pan before cutting into squares, so the blondies firm up as they cool.

Notes

For the chewiest texture, underbake slightly—look for a golden top with only a faint jiggle in the center. Store airtight at room temperature for up to 3 days or refrigerate up to 5 days; freeze up to 2 months (wrap tightly to prevent color bleed). For a gluten-free option, use a 1:1 gluten-free all-purpose flour blend.