Cottage cheese is often used in lasagna to add flavor and texture to the dish, however, there are several other options that can be used as a substitute. Ricotta cheese is the most commonly used substitute, as it is similar in texture and flavor, but it also contains fewer calories. Other alternatives include cream cheese, feta cheese, ricotta salata, and ricotta and cream cheese mixtures. Each of these substitutes will add a different flavor to the lasagna, so experiment to find one that works best for the dish.