First, drain the juice from the can of pineapple into a medium bowl (you'll need that later for the sauce.) It should give you about a cup of pineapple juice.
Place frozen meatballs into a 4-6 quart crock pot.
Then top meatballs with pineapple chunks and green peppers.
In the bowl where you put the pineapple juice you set aside earlier, whisk in the brown sugar, vinegar, soy sauce and cornstarch.
Pour sauce over meatballs. Cover and cook on low for 2 hours.
After a couple of hours, switch your crock pot to high and cook for an additional hour. Doing this will thicken the sauce. The sauce should be thicker and bubbling around the edges when ready.
Source:
thecountrycook.net