For the Apple Filling

• 6 medium apples, peeled, cored, and sliced – Use a mixture of sweet and tart apples for a balanced flavor and good texture.
• ⅓ cup granulated sugar – Adds sweetness to the apples.
• 1 tablespoon all-purpose flour – Helps thicken the juices released by the apples during baking.
• 1½ teaspoons ground cinnamon – Adds warm, classic apple crisp flavor.
• ¼ teaspoon ground nutmeg – Provides subtle warmth and depth.
• 1 teaspoon vanilla extract – Enhances the natural sweetness of the apples.
• 1 tablespoon fresh lemon juice – Adds brightness and helps balance the sweetness.
• ¼ teaspoon salt – Enhances all the flavors.

For the Cinnamon Oat Topping

• 1 cup old-fashioned rolled oats – Creates a hearty, crispy texture.
• ¾ cup all-purpose flour – Provides structure for the crumble topping.
• ¾ cup packed brown sugar – Adds sweetness and a rich caramel-like flavor.
• 1 teaspoon ground cinnamon – Gives the topping extra warmth.
• ¼ teaspoon salt – Balances the sweetness.
• ½ cup unsalted butter, melted – Creates a rich, buttery, golden topping.
• ½ cup chopped pecans or walnuts, optional – Adds extra crunch and nutty flavor.

Optional Garnishes

• Vanilla ice cream
• Whipped cream
• Caramel sauce
• Powdered sugar
• Chopped pecans
• Extra cinnamon