Susan's Rocky Road Brownies

This recipe comes way back from the days when I was married and living in Kennewick, Washington. These were originally "Sister Hall's Rocky Road Brownies." My former wife, Susan, brought them home one day from Relief Society. These are killers--guaranteed to please. I got these as part of the divorce settlement.

3 sticks butter, divided
2 cups sugar
2/3 cup cocoa, divided
4 eggs
1-1/2 cups flour
1/4 teaspoon salt
1 cup walnuts
4 teaspoons vanilla, divided
1 small package miniature marshmallows
2 cups powdered sugar (1 lb package)
1/3 cup evaporated milk

Grease a 9" x 13" cake pan. Preheat the oven to 350 F. Cream 2 sticks of butter, sugar, and 1/3 cup cocoa. Add eggs, one at a time, beating well after each. Add flour, 2 teaspoons vanilla, and salt. Fold in the nuts. Spread in the cake pan, and bake for 25 minutes. Remove from the oven and cover with the marshmallows. Return to the oven for three minutes. Remove the brownies from the oven and cool completely.

Frost the brownies: Cream the remaining stick of butter. Mix in the powdered sugar, the remaining cocoa, milk, and vanilla. Add a pinch of salt. Beat at medium to high speed until very creamy.

These brownies are a deeply satisfying chocolate experience.