This is the recipe I use.

White Chocolate Party Mix

1 (10 oz) pkg mini pretzels
5 cups Cheerios®
5 cups Corn Chex®
2 cups salted nuts
1 pound M&Ms® plain chocolate candy
2 packages (12oz each) vanilla chips
3 tablespoons veg. oil

In a large bowl, combine the first 5 ingred.; set aside. In a microwave bowl, heat chips and oil on med-high for 2 min., stirring once. Microwave on high 10 sec., stir until smooth. Pour over cereal mixture and mix well. Spread on 3 waxed paper-lined baking sheets. Cool; break apart. Store in airtight container.

Yield: about 5 qts