Vegan adaptation inspired by 'Apple Pie with Crumb Topping' in Good Lookin' Cookin': A Year of Meals - A Lifetime of Family, Friends, and Food by Dolly Parton and Rachel Parton George. The original uses dairy butter and allows a store-bought or homemade pie crust. This version uses vegan butter throughout and includes a from-scratch vegan crust so no packaged crust is required. The apple quantities, spices, thickening method, oat crumb structure, and two-temperature baking method are based on the photographed cookbook recipe.