Place pastry shells on a baking sheet. Bake at 325° for 5 minutes or until lightly browned. Stir together cheese and flour.
Whisk together eggs and whipping cream; stir in cheese mixture and diced ham. Cover and chill 8 hours, if desired. Spoon mixture evenly into prepared pastry shells. Place on a baking sheet.
Bake at 325° for 25 minutes.
Note: You can make ahead and freeze baked tartlets. Thaw, and bake tartlets again at 325° for 10 minutes or until thoroughly heated.