Combine the first 5 ingredients in a bowl; beat at medium speed of a mixer until well-blended. Combine flour, cocoa, baking powder, and salt; stir well. Add to sugar mixture; beat just until dry ingredients are moistened. Pour mixture into a 9-inch square baking pan coated with cooking spray. Bake at 375° for 25 minutes.
Remove from oven, and sprinkle with the chocolate morsels. Let stand 3 minutes or until morsels soften; spread softened morsels over brownies, using a knife or metal spatula. Let cool on a wire rack.