These can easily be made ahead and frozen.

Brownie Layer
3/4 cup flour
1/4 teaspoon baking soda
1/4 teaspoon salt
1/2 cup granulated sugar
1/3 cup vegetable shortening
2 tablespoons water
2 eggs
1 (6 ounce) package semisweet chocolate chips
1 teaspoon vanilla extract
1 1/2 cups coarsely chopped walnuts
4 tablespoons bourbon

White Frosting Layer
1/2 cup butter or margarine
1 teaspoon vanilla extract
2 cups confectioners' sugar

Chocolate Glaze Layer
1 (6 ounce) package semisweet chocolate chips
1 tablespoon vegetable shortening

Brownie Layer: Sift dry ingredients. Combine sugar, shortening and water in pan. Heat, stirring constantly until sugar melts and mixture boils. Remove from heat. Stir in chocolate chips and vanilla extract until smooth. Beat in eggs 1 at a time. Stir in dry mixture and nuts. Spread evenly in 9-inch square pan. Bake at 325 degrees F for 30 minutes or until shiny and firm on top. Remove from oven and sprinkle bourbon on top while still hot. Cool completely.

White Frosting Layer: Beat butter and vanilla extract until creamy. Add sugar gradually until smooth and spreadable. Spread evenly on top of brownie layer. Chill until firm.

Chocolate Glaze Layer: Melt in double boiler (or in microwave with very low power). Spread glaze on top. Chill. Cut into squares. Chill until served.