Sour Cream Coffee Cake

1/2 c. butter, softened
1 c. sugar
2 eggs
1 c. sour cream
1 tsp. vanilla
2 c. flour
1 tsp. baking powder
1 tsp. baking soda
1/4 tsp. salt

Topping:
1/4 c. sugar
1/3 c. brown sugar
2 tsp. cinnamon
1/2 c. chopped pecans (opt.)
In a mixing bowl, cream together the butter and sugar. Add eggs, sour cream and vanilla; mix well. Combine flour, b. powder, b. soda and salt; add to creamed mixture and beat until combined. Pour half the batter into a greased 13 x 9 baking pan. Combine topping ingredients and sprinkle half of the topping over the batter. Add remaining batter and then topping. Bake 325 degrees for 40 minutes or until done.