Creating this amazing Apple Pie Filling is straightforward if you follow these steps:

1. Prep the Apples: Peel, core, and slice the apples into thin wedges. Place them in a large mixing bowl.
2. Add Lemon Juice: Drizzle lemon juice over the apple slices to prevent browning and add flavor.
3. Mix Dry Ingredients: In a separate bowl, combine granulated sugar, cornstarch, cinnamon, nutmeg, and salt.
4. Combine Mixtures: Pour the dry mixture over the apples and toss until the apples are evenly coated.
5. Cook the Filling: In a large saucepan, add the apple mixture. Cook over medium heat, stirring occasionally, until the apples start to soften (about 10 minutes).
6. Thicken the Filling: Continue to cook until the mixture thickens and becomes syrupy, about 5-10 minutes more.
7. Add Butter and Vanilla: Stir in butter and vanilla extract for added richness and flavor (if using).
8. Cool: Remove from heat and allow the filling to cool before using it in your favorite recipes.

Following these steps will lead you to a delicious Apple Pie Filling that is sure to impress!