Position an oven rack in the center of the oven, and preheat to 325 degrees F. Whisk together the butter, brown sugar, maple syrup, vanilla, apple pie spice and salt in a large bowl. Add the oats, and toss until evenly coated. Spread out on a rimmed baking sheet.
Bake the mixture until golden and toasted, 30 to 35 minutes, stirring about halfway through. Let cool completely on the baking sheet. Stir in the pita chips and apple chips. (The granola can be stored in an airtight container at room temperature for up to 5 days.)
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