Dutch apple pies are finished with a streusel — a sweet, crunchy crumb topping made with flour, sugar, and butter. For this pie recipe, we add chopped walnuts to the streusel for flavor and crunch.
In a large bowl, combine the flour, brown sugar, oats and butter; set aside 1 cup for topping. Press remaining crumb mixture into an ungreased 9-in. pie plate; set aside. For filling, combine the ...