Mix the sugar, flour, salt, and cinnamon together. Toss the apples in this mixture and spread them evenly in a 10” cast iron skillet.
Mix the topping ingredients until they are crumbly, then sprinkle this mixture evenly over the apples.
Bake the Apple Crisp until the apples are soft and a crust forms. In the oven, you would bake this at 350 degrees for 45–60 minutes. In the smoker, I used a lower temperature incorperate more smoke flavor, then raised the temperature at the end to brown it more.