Frozen lasagna is great to have on hand for unexpected guests who drop in, last-minute gatherings or weeknight dinners. It can be baked or reheated from frozen—you just need to increase the cooking time. Or, if you do have a day's notice, you can thaw thaw it in the fridge ahead of time.
Cooking Lasagna From Frozen
Preheat the oven to 400 degrees Fahrenheit.
Lift the foil lining the baking pan the lasagna was frozen in and transfer the frozen lasagna to a room-temperature baking pan. (Rapid swings in temperature from going directly from the freezer to the oven can damage baking pans.)
Cover the new pan of frozen lasagna with a fresh sheet of aluminum foil.
Place the pan in the oven and bake for 90 minutes.
After 90 minutes, uncover the pan and brown the top of the lasagna for another 30 minutes, or until the center of the lasagna is hot and bubbly.
Remove lasagna from the oven, and serve.
Thawing Lasagna in the Refrigerator
Transfer the frozen lasagna pan to the refrigerator 24 hours before baking.
When ready to cook, preheat the oven to 400 degrees Fahrenheit.
Cover the thawed lasagna with a fresh sheet of aluminum foil.
Place the pan in the oven and bake for 40 minutes.
After 40 minutes, uncover the lasagna and bake for another 20 to 25 minutes until the top is lightly browned and bubbly.
Remove from the oven and serve.