Tender cinnamon apples under a crunchy brown sugar oat topping. One bowl for the filling, one for the topping, about an hour start to finish.
Apples: use firm apples that hold their shape (Granny Smith, Honeycrisp, Braeburn, Jonagold, Pink Lady). Avoid Red Delicious and McIntosh, which turn mushy.
Make ahead: assemble up to a day in advance, cover and refrigerate, then bake from cold and add 5 to 10 minutes.
Storage: cover and refrigerate leftovers for up to 4 days. Reheat in a 300°F oven for about 15 minutes to re-crisp the topping.
Freezing: bake, cool completely, wrap well and freeze up to 3 months. Thaw overnight in the fridge and reheat in the oven.
Gluten-free: use a 1:1 gluten-free flour blend and certified gluten-free oats.
Smaller batch: halve everything for an 8×8-inch dish and bake 35 to 40 minutes.
Keywords: apple crisp, easy apple crisp, old fashioned apple crisp, apple crisp with oat topping