Arrange 2 racks to divide the oven into thirds and preheat to 250°.
Line 2 rimmed baking sheets with parchment paper.
In a medium bowl, whisk together the melted butter, Worcestershire sauce, and the 2 packets of Top Ramen® Chili seasoning. Set aside.
In a large bowl, combine the crushed Top Ramen® noodles, Rice Chex™, Corn Chex™, pretzels, and peanuts.
Pour half of the butter mixture over the Chex™ mixture and gently toss. Pour in the remaining butter mixture and gently toss again until well coated.
Transfer the mixture onto the 2 prepared baking sheets and spread into an even layer. Bake, stirring every 15 minutes, until lightly browned and crisp, 45 to 50 minutes total. Let cool for 10 minutes on the baking sheets before serving.
Once completely cooled, store in an airtight container at room temperature for several weeks.