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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.
Bake frozen lasagna at a medium-high temperature. If you use a conventional oven, set it to 400 degrees Fahrenheit. To cook the lasagna in the same amount of time in a convection oven, you only need to set it to 350 F because the fan circulates the oven's heat more efficiently.n a conventional oven, it will take approximately 90 minutes to fully bake a 38-ounce frozen lasagna, and just 20 additional minutes to bake a 96-ounce family-sized casserole.