INGREDIENTS
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1 pound ground beef
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1 tablespoon olive oil
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1 white onion, small diced
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16 ounces pasta shells, cooked
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2 cups shredded mozzarella cheese
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1 cup cottage cheese
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8 ounces ricotta cheese
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1 egg, beaten
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1 cup grated Parmesan cheese
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2 teaspoons dried oregano
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2 teaspoons dried parsley
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1 teaspoon dried thyme
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24-ounce jar tomato sauce