Cake:

1 stick butter
1 c sugar
2 eggs
2 c flour
1 t baking powder
1 t baking soda
1 c sour cream
1 t vanilla

Cream butter and sugar, add in eggs. Mix dry ingredients together and add to creamed mixture. Add sour cream and vanilla.

Filling:

1/2 c chopped walnuts
1/2 c sugar
2 t cinnamon

Grease cake sized square baking pan approx. 8x8. Pour half of cake mixture into pan. Pour half of filling over cake mixture. Pour rest of cake mixture on top of filling, then top with remaining filling.

Bake at 350 F for 45 minutes.