1Heat oven to 350°F. Spray square pan, 8x8x2 inches, with cooking spray.
2Mix granulated sugar, flour, cocoa, baking soda and salt in large bowl; set aside. Mix remaining brownie ingredients in small bowl. Add to flour mixture; stir just until dry ingredients are moistened. Spread evenly in pan.
3Bake 15 to 20 minutes or until toothpick inserted in center comes out clean. Cool at least 30 minutes on wire rack.
4Mix powdered sugar and 1 tablespoon liqueur in small bowl. Fold in whipped topping. Spread evenly over cooled brownies. Sprinkle with chopped chocolate.