INGREDIENTS
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1 (12 ounce) box ziti noodles
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1 (16 ounce) container ricotta cheese (can be low-fat)
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2 egg whites
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1/2 cup Parmesan cheese
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1 and 1/2 cups shredded mozzarella, divided
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1/4 teaspoon salt
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1/2 teaspoon pepper
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2 (24 ounce) jars spaghetti sauce, divided
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8 ounces sliced mushrooms
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1 (10 ounce) bag fresh spinach