Use leftover cooked pasta to make new, exciting dishes. You can always mix it with leftover sauce and reheat it, or you can make a fresh pasta salad. Soups and casseroles are also great for putting leftover pasta to good use. They will warm up nicely and slowly in the casserole and absorb the flavors. Similarly, you can make a baked pasta dish with just a few ingredients or serve it with olive oil, garlic, and herbs as a simple side dish.