Coat a 12-cup Bundt pan with cooking spray, and sprinkle with flour, shaking to coat pan.
Beat cake mix and next 5 ingredients at medium speed with an electric mixer 4 minutes. Spoon into pan.
Bake at 325° for 45 minutes or until a wooden pick inserted in center comes out clean. Cool in pan on a wire rack 10 minutes. Remove from pan; cool completely on wire rack. Serve with Raspberry Sauce; garnish, if desired.