3/4 cup all purpose flour
1/2 cup unsweetened cocoa powder
1 teaspoon baking powder
1/2 teaspoon salt
6 tablespoons unsalted butter, melted
3/4 cup granulated sugar
1 large egg
1/4 cup white chocolate chips
1/2 cup milk chocolate chips, divided
3/4 cup mini marshmallows
Heat oven to 350 degrees F. Line an 8x8-inch baking dish with foil; coat foil with nonstick cooking spray.
In a medium mixing bowl, sift together flour, cocoa powder, baking powder and salt. In a large mixing bowl, whisk together melted butter, sugar and egg until well combined. Whisk in dry ingredients until just combined. Stir in white chocolate chips and 1/4 cup milk chocolate chips until combined. Scrape batter into prepared dish and top with additional 1/4 cup milk chocolate chips
Bake 20-25 minutes or until set and crusty looking around the edges. Top with marshmallows; flatten marshmallows with the tips of your fingers. Dust additional cocoa powder on top, if desired.
Makes 9 brownies