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3. In a separate bowl, combine the onion, garlic, ricotta cheese, Parmesan cheese and eggs.
4. Evenly spread ricotta mixture on top of pasta.
5. Cover and cook on high for 3 hours.
6. Uncover slow cooker and sprinkle Asiago cheese and fresh basil over the top. Cover and cook for another 15 minutes, until Asiago is melted.
Pro tip: To make this dish even heartier, brown some ground beef or sausage beforehand and add it as a layer!