Preheat oven to 350°F.
In a large mixing bowl, combine corn chips, rice cereal squares, peanuts, and pretzels.
In a separate bowl, mix together melted butter, taco seasoning, garlic powder, onion powder, cumin, chili powder, paprika, and cayenne pepper (if using).
Pour the butter mixture over the snack mix and toss to coat evenly.
Spread the mixture onto a baking sheet and bake for 10-15 minutes, or until the mix is slightly golden brown.
Remove from oven and let it cool.
Serve and enjoy!