Batter:

1/2 c. butter, softened
1 c. sugar
2 eggs
1 tsp. vanilla
2 c. flour
1/2 tsp. salt
1 tsp. baking powder
1 c. sour cream

Filling:

3/4 c. chocolate chips
2 tbsp. brown sugar
1/4 c. sugar
2/3 c. crushed walnuts
1 1/2 tsp. cinnamon

Grease and flour tube pan and set oven to 350°F. Combine butter, sugar, eggs, vanilla and sour cream; mix well. Add dry ingredients for the batter. Spoon 1/2 of batter in tube pan.

Combine all filling ingredients in small bowl. Sprinkle 1/2 the filling over batter. Spoon remaining batter over the filling. Sprinkle remainder of filling over the top.

Bake for 45 minutes.