To Make Crust: In a medium mixing bowl blend softened cream cheese and 1/2 cup butter or margarine until thoroughly combined. Add flour and mix well. Place in refrigerator to chill.
In a medium mixing bowl combine brown sugar and 1 tablespoon butter or margarine. Add egg and vanilla, and blend well. Stir in pecans.
Pat crust into the bottoms of paper muffin cups. Pour in filling, distributing evenly between all cups. Bake in preheated oven for 30 minutes.
