Whisk together the butter, Fall Spice Mix and Worcestershire sauce in a cup. In a large, microwave-safe bowl, combine the cereal, pretzel nuggets and pecans. Drizzle the butter mixture over the snack mix and heat in the microwave until warm and fragrant, stirring halfway through, about 2 minutes. Add the apple chips. Toss vigorously and let cool to room temperature, about 15 minutes. Season with salt.
Fall Spice Mix:
Whisk together the cinnamon, pepper, cardamom, nutmeg and salt in a small bowl. Transfer any leftover mix to an airtight container and store for up to 6 months.