INGREDIENTS
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1 tablespoon olive oil
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1 medium onion, diced
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4 garlic cloves, minced
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1 pound Italian sausage, crumbled
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1 can (28 ounces) crushed tomatoes
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1 1/2 teaspoon dried oregano, divided
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1 1/2 teaspoon dried basil, divided
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1 1/2 teaspoon dried thyme, divided
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1 carton (15 ounces) part skim ricotta cheese
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2 1/2 cups shredded mozzarella cheese, divided
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1/2 cup grated Parmesan cheese
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1 package (10 ounces) frozen chopped spinach, thawed and squeezed dry
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1 egg
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9 lasagna noodles, cooked