Chocolate Glaze: Combine ½ cup semi-sweet chocolate chips with 2 tablespoons butter or margarine in a glass measuring cup. Microwave on high for 1 minute. Stir to blend, adding 1 tablespoon powdered sugar.

In mixing bowl, combine cocoa, sugar, flour, baking powder, chocolate chips and ½ cup chopped pistachios. Add melted butter, egg and milk; mix just until ingredients are blended. Scrape batter into oiled 9-inch square baking pan. Bake in preheated 350° F. oven, 23 to 25 minutes or until center is baked. Do not over bake. Cool slightly; spread with Chocolate Glaze. Sprinkle with remaining pistachios.