INGREDIENTS
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9 uncooked gluten-free lasagna noodles
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1 teaspoon olive oil
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7 cups sliced mushrooms
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3 cups sliced shiitake mushroom caps
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1/2 teaspoon ground nutmeg
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3 garlic cloves, minced
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2 (15-ounce) containers part-skim ricotta cheese
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2 (10-ounce) packages frozen chopped spinach, thawed, drained, and squeezed dry
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6 tablespoons grated fresh Parmesan cheese, divided
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1 teaspoon dried Italian seasoning
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1 teaspoon freshly ground black pepper
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3 large egg whites
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1 (25.5-ounce) jar gluten-free marinara sauce
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Cooking spray
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3 cups (12 ounces) shredded part-skim mozzarella cheese, divided
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Fresh oregano leaves (optional)