1 pkg. yellow cake mix
2 tbsp. all purpose flour
1 pkg. instant pistachio pudding
4 eggs
1 c. sour cream
1/2 c. water

Combine all ingredients and blend until moistened. Beat for 2 minutes at medium speed with electric mixer. Pour into well greased and floured bundt or tube pan (10 inch). Bake at 350 degrees for 40-45 minutes or until done. Cool in pan 10 minutes; remove and cool on cake rack. Sprinkle with powdered sugar if desired. Freezes well.