tablespoons of the sour cream. pour batter into the crust-lined pan. place in a shallow baking pan in oven.
bake for 25 to 30 minutes or until a 1-inch area around the outside edge appears set when gently shaken. remove from oven. in a medium bowl stir together the remaining sour cream, the 1 tablespoon sugar, and the remaining 1/2 teaspoon vanilla. gently spread mixture evenly over baked cheesecake. return to oven and bake for 5 minutes more.
cool in pan on a wire rack for 15 minutes. using a small sharp knife, loosen crust from sides of pan. cool for 30 minutes more. remove sides of pan; cool completely on rack. 