Light Sour Cream Coffee Cake

Cream:

4 oz butter

1/2 cup applesauce

1/2 cup sugar

1/2 pint light sour cream + more

1 tbsp vanilla

Add:

1 cup flour

1 cup whole wheat flour

1/4 tsp salt

1 tsp baking powder

1 tsp baking soda

Filling:

3/4 cup crushed walnuts

1/8 cup sugar

1 tsp cinnamon

Bake at 350 for 45 minutes in a bundt pan.