INGREDIENTS
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2 tablespoons olive oil
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1 sweet onion, diced
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2 garlic cloves, minced
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1 pound ground beef
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1 teaspoon salt
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3/4 teaspoon freshly ground black pepper
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1 teaspoon dried oregano
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1 1/2 cups marinara sauce
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2 pounds ravioli, thawed if frozen (we used mushroom, but any kind of filling will do)
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1 1/2 cups ricotta cheese
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2 cups shredded mozzarella cheese
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3 tablespoons chopped fresh basil, as needed for garnish