Preheat oven to 300 degrees.
Line a 9-by-13-inch baking pan with foil; butter foil. Spread popcorn in pan and drizzle with melted butter; toss popcorn. Sprinkle popcorn with sugar and cinnamon, and toss again.
Bake 7 minutes. Remove the pan from the oven.
Sprinkle apple chips over popcorn. Heat an additional 3 minutes in the oven.
Serve warm, or cool to room temperature. Store in airtight container.