Cake:
3/4 c. butter, softened
1 1/2 c. sugar
3 eggs
1 1/2 tsp. vanilla
3 c. flour
1 1/2 tsp. baking powder
1 1/2 tsp. baking soda
1/4 tsp. salt
1 1/2 c. sour cream
Filling:
1/3 c. packed brown sugar
1/3 c. sugar
1/2 c. finely chopped pecans
1 1/2 tsp. cinnamon
Heat oven to 350 degrees. Grease 12 cup bundt pan. In large mixing bowl, combine butter, sugar, eggs, and vanilla. Beat on medium speed for 2 minutes. Mix in flour, baking powder, baking soda and salt alternately with sour cream. Spread 1/3 of batter in pan and sprinkle with 1/3 of filling. Repeat twice.
Bake 60 minutes or until wooden toothpick inserted in center comes out clean.