Yield: 9 servings.
1 stick unsalted butter, melted
¾ cup dark brown sugar, packed
1 large egg
1½ teaspoons vanilla extract
1 teaspoon baking powder
¼ teaspoon baking soda
½ teaspoon kosher salt
1¼ cups all-purpose flour
⅓ cup cornflakes
⅓ cup white chocolate chips
⅓ cup mini marshmallows
Flake salt (for garnish)
Preheat oven to 350°. Prepare a 9-inch square baking pan with cooking spray and line with parchment paper.
In a large bowl, whisk together butter, brown sugar, egg, and vanilla extract until well combined.
In a separate bowl, whisk together baking powder, baking soda, salt, and flour. Add dry ingredients to the butter mixture and stir until just combined. Do not overmix.
Into a food processor, add cornflakes and pulse a few times until you’re left with crumbs.
Add crumbs to blondie batter with chocolate chips and marshmallows; fold until just combined. Pour batter into pan and evenly spread to all 4 corners.
Bake for 25 minutes or until blondies are lightly browned and a toothpick inserted into the center comes out clean. Let cool in the pan for 30 minutes on cooling rack. Cut blondies into 9 squares and sprinkle a few flakes of salt on each before serving.
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