Fudgy Marshmallow Brownies

Name: Fudgy Marshmallow Brownies
Ingredients: 1 C butter; 2 C sugar; 1/2 C cocoa; 4 eggs; 1 1/2 C flour; 1/4 tsp salt; 2 tsp vanilla; 5 C mini marshmallows; 3 C pwodered sugar; 1/2 C cocoa; 1/3 C milk; 1/2 C butter; 1 tsp vanilla