8 tbsp. (one stick) unsalted butter
4 1/2 cups rice Chex cereal
4 1/2 cups wheat Chex cereal
2 cups bite-sized or mini pretzel twists
2 cups cheese crackers, such as Cheez-Its
1 cup Oyster crackers
2 (1-oz) packets ranch dressing seasoning mix (about 1 cup total) divided
arrange 2 racks to divide the oven into thirds and heat the oven to 250F. Line 2 rimmed baking sheets with parchment paper. Place butter in microwave for 50-60 second, in 10 second intervals stirring in between each. place rice Chex, wheat Chex, pretzel twists, cheese crackers, oyster crackers, and 1 packet of ranch seasoning mix in a large bowl, and lightly toss to combine. Pour half of the butter over the cereal mixture and gently toss to coat. Sprinkle in the remaining ranch packet and butter, then gently toss again so all the pieces are evenly coated. Divide the mixture between the prepared baking sheets and spread into and even layer. bake, stirring every 15 minutes, until lightly browned and crisp, 45-50 minutes total. Let cool for 10 minutes on the baking sheets before serving.