Stir the puffed rice, wasabi peas, pumpkin seeds, and soy nuts together in a medium bowl. In another small bowl, whisk the vegetable oil, brown sugar, soy sauce, Worcestershire sauce, sesame oil, garlic powder, ginger, and cayenne, to taste. Pour the wet mixture over the puffed rice mixture and toss until thoroughly coated. Spread the mixture in a single layer on the prepared baking sheet. Bake until lightly browned and crisped, about 20 minutes, stirring once halfway through. Cool on the baking sheet to crisp fully. Serve at room temperature.

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