Mix flour and sugar. Cut in butter and cream cheese until coarse and crumbly. Add vanilla and buttermilk. Stir until well blended. Turn out on a floured surface, knead until easy to handle. Roll or pat to 1 inch thick circle. Cut with a 1 1/2 inch biscuit cutter or to desired shape. Place on a greased cookie sheet. (Instead, I use parchment paper on a cookie sheet.) Brush tops with heavy cream or milk. Bake at 400 degrees 15 minutes until lightly brown on edges.