reheat oven to 350.

Combine flour, brown sugar, oats, salt, chopped pecans, and melted butter in a medium bowl. Pack 1 cup of the mixture into a measuring cup and set it aside; gently press remaining mixture into a 9″ pie plate. Be sure not to pack it in there too tightly or it will be too hard and messy to slice the pie when it’s baked.

In a small saucepan, combine sugar, cornstarch, salt, water, and vanilla and bring to a boil. While mixture is heating, place apples in the pie crust. After sugar/water mixture has come to a boil, pour the hot mixture over the apples. Sprinkle reserved crumb topping over apples and then place the pie plate on a baking sheet.Bake for 43-45 minutes. During the last 15 minutes or so, you may need to cover the pie with a sheet of aluminum foil to keep the pie from getting too brown.

Serve warm (if you can) with a scoop of vanilla ice cream or a dollop of sweetened whipped cream.