Aunt Nedra's Chocolate Marshmallow Cookies

Aunt Nedra is a great cook. She has brought these cookies to many family reunions.
Cream:
1 c. sugar
1/2 c. butter
2 eggs
1 tsp. vanilla
1/2 c. evaporated milk (add alternately with dry ingredients)
2 c. flour
1/3 c. cocoa
1/2 tsp. salt
chopped nuts (opt)
Drop by teaspoon on cookie sheet. Bake 6-8 minutes. Watch until cookie is not shiny. Place 1/2 large marshmallow on cookie -sticky side down. Place cookies back in oven. Turn oven off so marshmallow won't toast - 1 minute or less. Pat marshmallow after puffed so it won't slide off. While still warm, frost with fudge frosting.
Fudge Frosting:
Powdered sugar- 2 cups
Butter, melted and cooled- 4 tablespoons (1/2 stick)
Cocoa powder-1/4 cup
Milk-1/4 cup
Pure vanilla extract- 1/2tsp
Preparation:
Place powdered sugar in a medium bowl.
Whisk in butter and cocoa powder. Add milk and vanilla, and whisk until well combined.