Chocolate Popcorn

12 cup air popped popcorn
1/4 cup butter
2 cups milk chocolate chips
1 cup corn syrup

Spray a large roasting pan with cooking spray. Put popped popcorn into pan. In a large saucepan, combine butter, chocolate chips and corn syrup. Cook over medium heat, stirring constantly, until mixture boils. Pour over popcorn and gently stir to coat. Bake at 300 degrees F for 45 minutes stirring frequently. Cool completely. Break into pieces and store in airtight container if you have any left.