Sift together first six ingredients and set aside. In a large mixing bowl, beat together remaining ingredients. Gradually add flour mixture to wet mixture and beat well. Spread batter in a 9 x 13" baking pan that has been sprayed with non-stick cooking spray. Bake at 350 degrees for 25 - 30 minutes, or until toothpick inserted in center comes out clean. Cool pan on wire rack and frost with your favorite frosting. (mine happens to be cream cheese ;-)