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Fireworks Blondies

Fireworks blondies are thick, chewy, and golden with red, white, and blue star sprinkles plus M&Ms baked right into every square. This easy blondie recipe bakes until the top is set and the center has a slight jiggle for that signature soft bite.
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Prep Time 15 minutes
Cook Time 25 minutes
Total Time 40 minutes
Servings: 16 servings
Course: Dessert
Cuisine: American
Calories: 290
Ingredients Equipment Method Notes

Ingredients
  

Wet base
  • 0.5 cup unsalted butter melted
  • 1 cup brown sugar packed
  • 1 large egg plus 1 egg yolk
  • 1 egg yolk reserved
  • 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
  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, then add egg, egg yolk, and vanilla and whisk until glossy.
  2. Stir in all-purpose flour, baking powder, and salt until just combined—do not overmix.
  3. Fold in red, white, and blue M&Ms, red and blue star sprinkles, and white chocolate chips.
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.
Cool and cut
  1. Cool completely in the pan before cutting into squares, so the blondies firm up as they cool.

Notes

For clean squares, let the blondies cool fully in the pan before lifting out with the parchment. Store covered at room temperature for up to 3 days or refrigerate for up to 5 days; freeze up to 2 months (wrap well). For a gluten-aware option, swap all-purpose flour with a 1:1 gluten-free baking flour blend and bake time may need 1–3 extra minutes.