Pasta Alfredo.
Chicken risotto.
A quick lunch using leftover chicken is chicken noodle soup. Heat up chicken or vegetable stock, add diced chicken, noodles instant ones are fine, any chopped vegetables such as broccoli, green beans, or leafy vegetables like spinach, even mixed salad leaves. Bubble well till heated through. Garlic, ginger, a splash of soy sauce can also be used.