Brown ground beef, onions and garlic until no pink remains, drain away the fat.
Add ground beef mixture to Large Crock Pot, I used a 6-Quart Crock Pot. Add all remaining ingredients except the uncooked shells.
Cook in the slow cooker on high for 2 hours or low for 4-5 hours.
Prepare shells al dente according to package directions. Drain well and stir into meat sauce. Cover and cook an additional 10 minutes to heat through.