In a large bowl, combine the first six ingredients; beat on low speed for 30 seconds. Beat on medium for 2 minutes. Pour half of the pumpkin mixture into a greased 9-inch square baking pan. In a small bowl, combine the topping ingredients; sprinkle half over the batter. Carefully spread with remaining batter. Sprinkle with remaining topping (pan will be full). Bake at 350° for 35-40 minutes or until a toothpick inserted near the center comes out clean. Cool on a wire rack.