1/2 c. butter
1 c. sugar
2 eggs
1/2 tsp. salt
1 c. buttermilk
2 tsp. vanilla
2 c. flour
1 tsp. baking powder
1 tsp. baking soda

FILLING:

1/2 c. brown sugar
1/4 c. white sugar
2 tbsp. flour
2 1/2 to 3 tbsp. butter
1 1/2 c. nuts, chopped (optional)
1 1/2 tsp. cinnamon

Beat sugar, butter, and eggs. Sift dry ingredients together and add alternately with buttermilk to first mixture. Add vanilla. Pour half batter into greased 9 x 9 inch pan. Top with filling, then rest of batter. Bake at 350 degrees for 35 to 40 minutes.