Storage: Cover leftovers tightly and refrigerate for up to 3 days. Reheat in the microwave or oven.
Variations: Add spinach or kale to the vegetable mix for extra greens. You can also substitute part of the mozzarella with parmesan for a sharper flavor.
Tips: If using fresh ricotta, drain it in a cheesecloth for 30 minutes to remove excess moisture and prevent a watery lasagna.