Preheat the oven to 350 degree F. In a 13x9x2-inch baking pan combine cereals, cheese crackers, and chow mein noodles.
Drizzle oil over cereal mixture and toss. Sprinkle with dry dressing mix and toss to coat. Bake in the 350 degree F oven about 10 minutes, stirring once. Cool in pan for 15 minutes. Store in a tightly covered container at room temperature for up to 1 week. Makes 6 servings.