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1
Prepare a grill for medium-high heat; preheat 5 minutes. In a medium bowl, combine chili powder, paprika, salt, oregano, garlic powder, granulated sugar, and cumin.
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2
Lay 4 (16"-by-12") pieces of heavy-duty foil on a flat surface. Spray foil with cooking spray. Divide potatoes among foil sheets. Top potatoes with bell pepper and onion. Sprinkle each with about 1 teaspoon spice mixture.
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3
Add chicken to remaining spice mixture and toss to coat. Divide chicken among foil; top each with 1 tablespoon butter. Fold and seal edges of foil to create a packet.
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4
Grill, covered and rotating packets halfway through, until chicken is cooked through and vegetables are tender, 18 to 22 minutes.
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5
Carefully open packets and serve with tortillas, sour cream, cheese, avocado, and lime wedges.
