Shortcut: Rotisserie chicken works great. For extra heat, add a pinch of crushed red pepper or use hot diced tomatoes with green chiles. If using regular long-grain rice instead of instant, par-cook it first or the casserole may be underdone. Store leftovers in an airtight container in the refrigerator up to 3 days or freeze up to 2 months; reheat covered until hot.