In large bag, place popcorn, crackers and pretzels. Sprinkle mixture with remaining ingredients except butter. Close bag; shake gently to distribute evenly. Drizzle mixture with butter. Quickly reclose bag and shake until all ingredients are evenly coated. Pour popcorn mixture onto large baking sheet and spread evenly. Bake at 300~ for 8 minutes. Cool snack mixture to room temperature and serve. Store in airtight container.