Preheat oven to 375 F. In a large mixing bowl or pot, combine pepitas, lime juice, soy sauce, and cumin. Toss to coat evenly. Add cereal and toss again.
Spread mixture out on a nonstick baking sheet. Spray lightly with oil and sprinkle with salt and cayenne, if desired. Bake 10 to 12 minutes, stirring halfway through, until toasty and lightly browned.
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