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Bake the lasagna for about 30 minutes while it is covered with tin foil. Remove the cover and bake for an additional 15 minutes or until the top layer of the lasagna is light brown and bubbly. Turn the oven off and let the lasagna stand for 10 minutes. This will give the lasagna time to settle.
Thawed store-bought lasagna can be cooked at either 350-400 F for anywhere from 25-55 minutes. The time may be adjusted depending on how quickly the entire dish finishes. Frozen store-bought lasagna can be cooked at either 350-400 F for anywhere from 45 minutes to 1 hour and 50 minutes.