Preheat oven to 250°. Combine popcorn, goldfish, toasted oat cereal, pretzels, oyster crackers and cashews in large bowl. Combine salad dressing mix and oil in small bowl. Add dressing to dry ingredients and toss well. Spread mixture on ungreased baking sheet and bake 15 minutes. Spread in single layer on paper toweling to cool; store in airtight container.