HEAT oven to 350ºF. Spray bottom of 8-inch square baking pan with no-stick cooking spray. Line pan with 16x8-inch aluminum foil. Leave overhang to remove baked brownies. Coat with no-stick cooking spray. Melt butter and chocolate in medium saucepan over low heat until smooth, stirring constantly. Add all remaining ingredients. Beat with wooden spoon until smooth and shiny.
SPREAD batter in prepared pan. Bake 25 to 30 minutes or until toothpick inserted in center comes out with wet crumbs. Cool 1 hour or until completely cooled. Cut into bars.