Hershey's Best Brownies

Hershey's Best Brownies 1 cup butter or 1 cup margarine 2 cups sugar 2 teaspoons vanilla 4 eggs 3/4 cup cocoa 1 cup all-purpose flour 1/2 teaspoon baking powder 1/4 teaspoon salt 1 cup chopped nuts (optional) Heat oven to 350 degrees. Grease 13x9x2 inch baking pan. Melt butter in microwave. Stir in sugar and vanilla. Beat in eggs, one at a time. Add cocoa, flour, baking powder and salt; beat until well blended. Stir in nuts, if desired. Pour batter into pan. Bake 30-35 minutes or until brownies begin to pull away from sides. Cool completely.