Preheat the oven to 350 degrees F. Toss the cereal, potato chips and melba together in a large bowl. Whisk the butter, mustard, Worcestershire, garlic powder, mustard powder, brown sugar, coriander, allspice and 1/2 teaspoon each salt and pepper in a separate bowl. Pour the sauce over the snack mix and toss to coat well. Spread out on a rimmed baking sheet and bake until the mix is toasted and almost completely dry, 16 to 18 minutes, tossing about halfway through.
Remove from the oven and stir in the onions and jerky. Let cool completely, and then store in an airtight container for up to 3 days.
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