INGREDIENTS
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(15-ounce) container whole milk ricotta cheese
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1 (10-ounce) package frozen chopped spinach, thawed, squeezed dry
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1 cup plus 2 tablespoons grated Parmesan
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3 ounces thinly sliced prosciutto, chopped
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1 large egg, beaten to blend
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3/4 teaspoon salt, plus more for salting water
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1/2 teaspoon freshly ground black pepper
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1 to 2 tablespoons olive oil
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12 uncooked lasagna noodles
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2 cups marinara sauce
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1 cup shredded mozzarella (about 4 ounces)