Preheat the oven to 250ºF.
Into a large bowl, combine the cereals with peanuts, cashews, and almonds.
In another mixing bowl, combine butter, soy sauce, sriracha, sesame oil, garlic, and ginger to make a sauce.
Pour sauce over the cereal and nut mixture and toss until incorporated.
Transfer the mixture to a parchment paper lined baking sheet and bake for an hour, being sure to stir the mixture every 15 minutes.