heat oven 350 degrees. Cut each miniature chocolate bar into 8 pieces. Stir together chocolate bars, nuts and marshmallows in a bowl and set aside.
prepare brownie mix according to directions. Bake brownies 2 min. less than called for in directions. Sprinkle marshmallow mixture over brownies surface. Return to oven continue to bake until marshmallows are puffed and slightly browned (approx 3min). Cool on wire rack then cut into squares. Makes 3 dozen mini brownies.