Preheat your oven to 300 degrees Fahrenheit and line a large baking sheet with parchment paper. Getting this step done early means you can move straight into baking once the granola mixture is ready. It also helps the oats toast evenly from the start.
In a saucepan over medium-low heat, combine the butter, brown sugar, apple cider, apple preserves, cinnamon, nutmeg, and salt. Whisk everything together until the butter melts completely. Let the mixture simmer gently for about a minute so the flavors meld.
Once the syrup has simmered, turn off the heat and stir in the vanilla extract right away. Adding vanilla off the heat keeps its flavor from cooking off. This little step makes a noticeable difference in the final taste.
In your large mixing bowl, stir together the rolled oats and chopped pecans. Make sure they're evenly distributed before adding any liquid. This helps every bite get some crunch from the pecans.
Pour the warm syrup over the oats and pecans, then toss thoroughly until every piece is coated. I like to use a spatula here so nothing gets left dry at the bottom of the bowl. A well-coated mixture bakes into better clusters.
Spread the granola in an even layer on your prepared baking sheet. Bake for 25 to 35 minutes, stirring twice during the cook time to prevent burning. You're looking for a deep golden color across the granola.
Remove the granola from the oven and let it cool completely on the pan without stirring. This resting time is what allows those big, crunchy clusters to form. Resist the urge to touch it while it's still warm.
Once cooled, break the granola into chunks and gently fold in the chopped dried apples. Sprinkle the crushed freeze-dried apple slices over the top for a finishing touch. Your granola is now ready to eat or store.