Crockpot Meatballs

I have made these on 2 seperate years for a Superbowl Party. They are a great item to do ahead and then just keep warm in the crockpot. Everyone always cleans them up, they are habit forming. The recipe says it makes 10 -12 servings.

3 lbs. ground beef
1 pkg. dry onion soup mix
14 oz. can of sweetened condensed milk (like Eagle Brand)

Sauce:
18 oz. bottle of ketchup
1/2 cup brown sugar
1/4 cup Worcestershire sauce

Combine beef, soup mix, and can of milk. Form into about 3 dozen meatballs, each about 1-1/2" around. Place meatballs on a baking sheet. Brown in a 350 degree oven for about 30 minutes. Remove from oven and drain. Place meatballs into slow cooker.
Combine sauce ingredients and pour over the meatballs. Cover. Cook on low 3 to 4 hours.