Mix together the melted butter and flour, forming a dough.
Stir in the chopped pecans.
Press the crust into a 13"x9" baking dish.
Bake at 350° for about 20 minutes, or until the crust begins to turn a golden brown.
Let the crust cool before adding any filling.
Notes
if you are making this crust with a regular pie where you bake the crust with the pie filling, just bake it according to the recipe instructions for that particular pie.