Source: Very Culinary
1 1/2 cups all purpose flour
2 teaspoons baking powder
1 teaspoon salt
1 cup (2 sticks) unsalted butter, cut into cubes
1 cup (6 ounces) semi-sweet chocolate chip morsels
5 large eggs
1 1/4 cups brown sugar
1 cup granulated sugar
2 teaspoons vanilla
1 1/4 cup honey graham cracker, roughly crushed with your hands
12 big marshmallows
Preheat oven to 350 degrees. Butter 9x13-inch baking pan with 2-inch-high sides.
Combine first 3 ingredients in small bowl.
In a microwave-safe bowl, melt chips and butter for 45-60 seconds, then check and stir. Continue to microwave in 15-second intervals, stirring each time, until completely melted.
Beat eggs, sugar and vanilla in large bowl to blend. Stir in warm chocolate mixture, then dry ingredients. Fold in graham crackers.
Pour batter into prepared pan. Dot with 12 large marshmallows. Bake until toothpick inserted into center comes out with moist crumbs attached, about 35- 40 minutes minutes.
Note: Marshmallows will be browned and puffy but will deflate as the brownies cool. Cool for at least 20 minutes than slice with a sharp knife, cleaning the knife with hot water if it gets too messy and sticky. Serve or wrap individually in wax paper for storing.