Mix popcorn, snacks, pretzels and cereal in large bowl. Mix remaining ingredients; drizzle over popcorn mixture, tossing until evenly coated. Spread in ungreased jelly roll pan, 15 1/2x10 1/2X1 inch.
Bake uncovered 15 minutes, stirring twice; cool. Store loosely covered at room temperature up to 2 weeks.
Place butter, chili powder and garlic in 3-quart microwavable casserole or bowl. Microwave uncovered on High about 1 minute or until butter is melted; stir. Stir in popcorn, snacks, pretzels and cereal. Toss until well coated. Microwave uncovered 6 to 8 minutes, stirring every 2 minutes, until toasted; cool.