Preheat oven to 250 degrees F.
In melted butter, stir in salad dressing. Add cereal, crackers and pretzles. Coat evenly. Spread evenly on cookie sheet or shallow cooking pan. Bake for 30 minutes stirring after 15 minutes.
Remove from oven and sprinkle with parmesan cheese. Spread on paper towel to cool. Store in airtight container.
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