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A Stack of Fireworks Blondies
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4.93 from 13 votes

Fireworks Blondies

Fireworks Blondies - this EASY blondie recipe is the BEST EVER COOKIE BAR! It's so soft and perfect with any additions, but especially with 4th of July M&Ms and sprinkles!
Prep Time15 minutes
Cook Time30 minutes
Total Time45 minutes
Course: Dessert
Cuisine: American
Servings: 24 bars
Calories: 148kcal
Author: Dorothy Kern
Cost: 8


  • ½ cup (113g) unsalted butter
  • 2 cups (400g) packed brown sugar
  • 2 large eggs
  • 1 teaspoon vanilla extract
  • ½ teaspoon salt
  • 1 teaspoon baking powder
  • 2 cups (248g) all purpose flour
  • 2 cups red white, and blue M&Ms
  • ½ cup patriotic sprinkles


  • Preheat oven to 350°F. Line a 9x13” pan with foil and spray well with cooking spray.
  • Mix butter and brown sugar with a stand or a hand mixer until crumbly. Mix in eggs and vanilla until smooth. Mix in salt, baking powder, then flour. Stir in M&Ms and sprinkles.
  • Spread in prepared pan. The mixture is wet so it’s best to spray your hands with cooking spray and then smooth the dough with your hands to get an even layer. Top with extra M&Ms if desired to make them look prettier.
  • Bake for about 22-25 minutes until they start to turn golden. Err on the side of under baked with these - they’ll finish baking as the cool and you don’t want them over baked.


  • For best results, bake in a metal pan.
  • Store in an airtight container for up to 4 days or freeze for up to 3 months.


Serving: 1bar | Calories: 148kcal | Carbohydrates: 26g | Protein: 2g | Fat: 4g | Saturated Fat: 3g | Polyunsaturated Fat: 0.3g | Monounsaturated Fat: 1g | Trans Fat: 0.2g | Cholesterol: 26mg | Sodium: 60mg | Potassium: 60mg | Fiber: 0.3g | Sugar: 18g | Vitamin A: 141IU | Calcium: 28mg | Iron: 1mg