Aunt Arta's Mint Brownies

This recipe is from my great great aunt Arta Hale. We McIntosh folk make it a lot.

BROWNIES
3 squares unsweetened baking chocolate
1 cup butter or margarine
4 eggs
2 cups sugar
1/2 teaspoon peppermint extract
1 cup flour
1/4 teaspoon salt
1 cup nuts (optional)

FROSTING
4 tablespoons butter, softened
2 tablespoons canned (evaporated) milk
2 cups powdered sugar
1 1/2 teaspoons peppermint extract
1-3 drops green food coloring

GLAZE
1 1/2 squares unsweetened baking chocolate
1 1/2 tablespoons butter

Melt chocolate and butter together and allow mixture to cool. Add eggs, sugar, extract, flour, and salt. Mix until combined. Add nuts and fold in. Pour into a greased and floured 9x13 pan (if using larger sheet pan you may need to increase the frosting recipe). Bake at 350 for 25 to 35 minutes. Cool before frosting.

Mix frosting ingredients together. Tint green. Spread over brownies. When frosting is set, melt chocolate and butter together, allow to cool slightly. Pour glaze over top of green frosting.