Preheat oven to 350 degrees F. In a large bowl, cream butter and sugar together until light and fluffy. Beat in the eggs and vanilla. Add the flour, cocoa and salt.
Spread into a greased 9x13 pan. Bake for 25-30 minutes or until a toothpick inserted comes out with moist crumbs. Do not over bake.
Preheat the broiler. Sprinkle baked brownies with marshmallows and cereal. Broil 1-3 minutes watching carefully until marshmallows are golden brown. Immediately sprinkle with chocolate. Cover with foil and let stand 5-10 minutes until chocolate begins to melt. Remove foil and cool before cutting into squares.
Recipe by Mandy's Recipe Box at https://mandysrecipeboxblog.com/fudgy-smores-brownies/