1Heat oven to 300°F. Spray with cooking spray or grease 15x10x1-inch pan.
2In very large bowl, mix cereals, corn snacks and peanuts. In small bowl, beat egg whites, orange juice, sugar and cinnamon with wire whisk or hand beater until foamy. Pour over cereal mixture, stirring until evenly coated. Spread in pan.
3Bake 45 to 50 minutes, stirring every 15 minutes, until light brown and crisp. Cool completely, about 1 hour. Store in airtight container.