Stir together first 5 ingredients.
Bring 1 cup water and next 3 ingredients to a boil. Add to flour mixture, and beat at medium speed with an electric mixer until smooth.
Beat eggs and next 3 ingredients at medium speed with electric mixer until blended. Stir into flour mixture. Pour into a greased and floured 15- x 10-inch jellyroll pan.
Bake at 350° for 25 minutes or until a wooden pick inserted in center comes out clean. Cool in pan on a wire rack 10 minutes. Spread Chocolate Frosting over warm cake; cool completely in pan on a wire rack. Sprinkle with chopped pecans, if desired.