Preheat oven to 350°F. Grease 9 x 13 pan. Gradually beat sour cream, then beat in sugar. Beat in eggs one at a time, then stir in vanilla. Mix flour, salt and baking powder together. Gently fold in flour mixture into the sour cream mixture until just incorporated. Spread batter into pan.

Pecan topping
Mix together brown sugar, pecans and cinnamon. Stir in melted butter and spread topping onto the batter.

Bake 30 - 35 minutes.