Go Back

Fireworks Blondies

Fireworks blondies are thick, chewy golden squares baked with red, white, and blue star sprinkles and M&Ms baked right in. The centers stay slightly soft for a tender bite, and the tops crackle as they cool.
Print Recipe Pin Recipe
Prep Time 15 minutes
Cook Time 25 minutes
Total Time 40 minutes
Servings: 16 servings
Course: Dessert
Cuisine: American
Calories: 260
Ingredients Equipment Method Notes

Ingredients
  

Fireworks blondies batter
  • 0.5 cup unsalted butter Melt and cool slightly if very hot.
  • 1 cup brown sugar Pack into the measuring cup for best chew.
  • 1 large egg Use 1 large egg plus an extra yolk.
  • 1 egg yolk Separate from a second egg.
  • 2 tsp vanilla extract
  • 1 cup all-purpose flour
  • 0.5 tsp baking powder
  • 0.25 tsp salt
  • 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
  • 1 8x8 baking pan

Method
 

Prep and bake
  1. Preheat oven to 350°F and line an 8x8 baking pan with parchment paper.
  2. Whisk melted butter and brown sugar together until smooth, then add egg, egg yolk, and vanilla and whisk until glossy.
  3. Stir in flour, baking powder, and salt until just combined—do not overmix, keeping the batter thick and slightly streaky.
  4. Fold in M&Ms, sprinkles, and white chocolate chips so the mix is evenly speckled.
  5. Spread batter evenly into the prepared pan and scatter extra sprinkles on top for a bright finish.
  6. Bake for 22–25 minutes at 350°F until the top is golden and set but the center still has a very slight jiggle, indicated by gentle movement in the middle.
  7. Cool completely in the pan before cutting into squares, since the blondies firm up as they cool.

Notes

Pro tip: for the chewiest texture, stop mixing once the flour disappears—overmixing can make blondies cakier. Store airtight at room temperature for 3 days or refrigerate up to 5 days; freeze in a sealed container up to 2 months. For a simple swap, use gluten-free 1:1 flour in the same amount for gluten-free blondies.