Instructions

  1. Combine flour, brown sugar, butter/margarine and oats; set aside 1 cup for the topping.
  2. Press remaining crumb mixture into an ungreased 9 inch pie plate; set aside.
  3. For the pie filling: combine sugar, cornstarch and water in a saucepan until smooth, bring to a boil.
  4. Cook and stir for 1 minute or until thickened.
  5. Remove from heat and stir in apples and vanilla.
  6. Pour filling mixture into crust and top with the 1 cup crumb mixture.
  7. Bake at 350 degrees for 45 minutes or until crust is golden brown.