→ Fruit Filling
01 - 6 medium apples (Granny Smith or Honeycrisp), peeled, cored, and sliced
02 - 2 tablespoons lemon juice
03 - 1/3 cup granulated sugar
04 - 2 tablespoons all-purpose flour
05 - 1 teaspoon ground cinnamon
06 - 1/4 teaspoon ground nutmeg
07 - Pinch of salt
→ Oat Topping
08 - 3/4 cup old-fashioned rolled oats
09 - 1/2 cup all-purpose flour
10 - 1/3 cup packed light brown sugar
11 - 1/2 teaspoon ground cinnamon
12 - 1/4 teaspoon salt
13 - 1/2 cup unsalted butter, cold and cubed
14 - 1/2 cup chopped pecans or walnuts (optional)