1 cup margarine or butter, softened
1 cup powdered sugar
1 1/4 cups unsifted flour
1/3 cup baking cocoa
1 can sweetened condensed milk
2 teaspoons vanilla extract
1 cup (6 ounces) semi-sweet chocolate chips
1/2 cup chopped nuts

Preheat oven to 350. Reserve 2 tablespoons margarine. In large mixer bowl, beat remaining margarine and sugar until fluffy. Add flour and cocoa; mix well. With floured hands, press into greased 13x9-inch baking pan. Bake 15 minutes. Meanwhile, in medium saucepan, combine reserved margarine and sweetened condensed milk; cook and stir until mixture thickens slightly, about 15 minutes. Remove from heat; stir in vanilla. Pour over crust. Bake 10-15 minutes longer or until golden brown. Remove from oven; immediately top with chips. Let stand 1 minute; spread while warm. Top with nuts. Cool. Cut into bars. Store covered, at room temperature.