01 - Preheat oven to 375°F. Line a baking sheet with parchment paper.
02 - In a large bowl, toss apple wedges with melted butter, lemon juice, brown sugar, cinnamon, and nutmeg until fully coated.
03 - Combine oats, flour, brown sugar, and salt in a separate bowl. Add cold butter and rub with fingertips until mixture forms coarse crumbs. Stir in nuts if using.
04 - Arrange apple wedges evenly on the prepared baking sheet. Generously sprinkle oat crumble over each wedge, pressing lightly to adhere.
05 - Bake for 18 to 20 minutes, or until apples are tender and crumble is golden brown.
06 - Cool for 5 minutes before serving warm. Optionally drizzle with honey or serve with vanilla ice cream.