Should you refrigerate biscuit dough before baking? If you have a frozen Stouffers Lasagna, you should always cook it while it is frozen. a) Thaw food thoroughly before cooking. If you have a frozen version, always cook it while it is frozen. Add salt, pepper, and cheese to the broth. The ones that we will be looking at are the Frozen lasagna with barnaise sauce. Thawing the lasagna in the microwave takes around 3 minutes for each serving. Plastic wrap will not melt in a conventional oven until temperatures reach about 220 degrees. higher temperatures result in less chewiness and more wet spots on the noodles.