1 box yellow cake mix
1/2 c. oil
2 pkgs. instant pistachio pudding mix
4 eggs
1/2 pt. sour cream
1 tsp. cinnamon
1/2 c. brown sugar
1/2 c. ground walnuts, chopped

Mix cake mix, oil, pistachio pudding, eggs and sour cream together to make batter. Mix together cinnamon, brown sugar and walnuts for filling.

Put 1/2 batter in a well-greased Bundt pan. Sprinkle with half of filling. Add balance of batter and top with rest of filling. Bake at 350 degrees for 50 minutes.