Ingredients

1 (18.25 ounce) package yellow cake mix
1 (3.5 ounce) package instant vanilla pudding mix
1/3 cup vegetable oil
4 eggs
1 cup plain yogurt
1 tablespoon unsweetened cocoa powder
1/2 cup chopped walnuts
1 teaspoon ground cinnamon

Directions

Beat yellow cake mix, instant vanilla pudding mix, oil, eggs and yogurt together until no lumps remain.

In a separate bowl mix cocoa, chopped nuts, and cinnamon together.

Spray a large bundt pan with cooking spray and put 1/2 of batter in pan. Sprinkle streusel mix over batter and top streusel with remaining batter.

Bake at 350 degrees F (175 degrees C) for 50 minutes. Cool for 15 minutes and take out of pan.