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Combine rice and water; let stand 5 minutes.
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Spoon evenly onto centers of four large sheets of heavy-duty foil; top each with 1 chicken breast half.
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Sprinkle evenly with chili powder. Drizzle with dressing; top with cheese and vegetables.
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Bring up foil sides. Double fold top and both ends to seal each packet, leaving room for heat circulation inside.
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Place in a single layer in a 15x10x1-inch baking pan.
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Bake 25 to 30 minutes or until the chicken is cooked through (170°F).
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Place one packet on each of four dinner plates.
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Cut slits in foil with a sharp knife to release steam before opening.