Reheat shredded cooked chicken or roasted vegetables in a skillet with some oil, sliced chile peppers, and a splash of chicken broth or water. Season with salt and pepper. Saute some sliced onions. Add a handful of shredded greens and a bit of cilantro, and wilt. Heat tortillas and fill with chicken or roasted vegetables and greens. Crumble some cheese over the top. Serve with diced onion, chopped cilantro, and lime.