Mississippi Mud Brownies (Tim Riggins Brownies)

INGREDIENTS

1 1/2 cups

all-purpose flour, lightly spooned into measuring cups and leveled with a knife

2 cups

sugar

1/2 cup

unsweetened cocoa powder

2 tsp

baking powder

1/2 tsp

table salt

1 cup

melted butter (no substitutions)

eggs, lightly beaten

1 tbsp

vanilla extract

1 cup

dark or semi-sweet chocolate chips or chunks

3 cups

mini marshmallows (or enough flat marshmallows to cover a 9×13″ pan)