I used my small crock-pot, since it's just the two of us. I browned ground beef with onion, drained off the grease. Added a can of diced tomatoes, half a big can of spaghetti sauce, minced garlic, salt-n-pepper, italian seasoning, a bit of nutmeg, and I think that is it. All was put in the crock on low, then on high when I added the macaroni. It came out great. Not all fresh ingredients, but it worked since I had no idea when dinner was going to be. I threw it in there and didn't have to worry about a time. When he got home, I gave him a salad and added the pasta.
I love that little crock-pot. It's supposed to be used for appetizer dips or fondues, but it comes in handy for 1-2 serving meals! That was one of the best purchases I ever made!