14 tablespoons butter, divided
4 ounces unsweetened chocolate, chopped
1-1/2 cups granulated sugar
2-1/4 teaspoon vanilla extract, divided
2 large eggs
1 cup flour
1/4 cup chopped walnuts or pecans
2-1/4 cups powdered sugar
1/2 cup unsweetened cocoa powder
3 or 4 tablespoons milk

Preheat oven to 400 degrees.

Grease 8 inch square baking pan.

In large saucepan over low heat, melt 8 tablespoons butter and chocolate, stirring constantly.

Remove from heat and stir in granulated sugar, 2 teaspoons vanilla, and eggs, one at a time.

Blend in flour and walnuts.

Spread in pan, and bake until brownies start to pull from the sides of the pan - about 18 to 20 minutes.

Frosting
In medium bowl with electric mixer, beat remaining butter and vanilla until creamy. At low speed, gradually add powdered sugar and cocoa, alternating with milk, beating well after each addition until frosting is smooth and fluffy.

Frost brownies when removed from oven by gently spreading frosting on.

Cut into 16 squares.
You can find a wide variety of electric mixers at Amazon.com. Here are just two of the possibilities: