Nut Mixture

1/2 cup chopped nuts (walnuts, pecans, whatever you want to use)
3 Tablespoons sugar
1 teaspoon cinnamon

Stir above together in small bowl and set aside.

Cake Mixture

1 package Duncan Hines Butter Cake mix
1 package Instant Pistachio pudding mix
4 eggs
1 cup sour cream
1/2 cup vegetable oil

Mix the above with hand mixer until well blended. Pour half the batter into an ungreased angel food cake pan. Top with nut mixture then pour remaining batter into pan.
Do not preheat oven. Place pan in oven and set oven temperature to 350 degrees. Bake for one hour or toothpick inserted in center of cake removes cleanly. Cool before removing from pan.
Enjoy