Favorite Dutch Apple Pie

Directions

1. Preheat oven to 350°. Mix flour, brown sugar, oats and butter; reserve 1-1/2 cups mixture for topping. Press remaining mixture onto bottom and up sides of an ungreased 9-in. pie plate.
2. In a large saucepan, mix sugar, cornstarch and water until smooth; bring to a boil. Cook and stir until thickened, about 2 minutes. Remove from heat; stir in apples and vanilla. Pour into crust. Crumble topping over filling.
3. Bake until crust is golden brown and filling is bubbly, 40-45 minutes. Cool on a wire rack.