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Preheat oven to 375°F.
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In the bottom of a 13 x 9-inch (3-quart) baking dish add a thick layer of sauce.
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Cover with pasta sheets. Do not overlap.
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Spread ricotta cheese evenly.
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Cover with pasta sheets.
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Spread a thick layer of sauce over noodles.
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Spread mushrooms evenly.
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Cover with pasta sheets.
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Spread a thick layer of sauce over noodles.
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Add fresh mozzarella and sprinkle with grated parmesan.
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Bake on middle rack until bubbling and golden, about 45 minutes.
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Let lasagne stand 20 minutes.
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I recommend assembling the lasagne1 day in advance before baking.
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Cover and refrigerate. Bring to room temperature before baking.