This can be used as a main dish, appetizer, or even a snack. My family loves them...

You will need:
1 package Italian style meatballs
1 16oz. jar of grape jelly
1 jar chilli sauce

Dump all the ingredients in the crock pot, set temp to low, and that's it. The meatballs are pre-cooked, so no real cook time persay. You can put them on before work and they will be ready for dinner. Even if you are in a rush, you can adjust the time to your needs.
Feeds my entire family as a main dish (3 adults, 4 children).

For a bit of extra flavor I will add 2 spoons lemon juice, 1/2 tsp of molasses, and a few dashes of hot sauce when adding everything to the pot. These are all optional, and though I use them all together, feel free to mix it up any way you like.