Spray slow cooker with non-stick spray (or you can buy the liners and make clean up super easy!)
Place 4 hamburger patties on the bottom of the slow cooker
Scatter onions and Worcestershire sauce on the top of the burgers
Layer another 4 burgers on top and repeat onions and worcestershire sauce
Keep layering until you have all of the patties in your slow cooker
Cook on low 4-6 hours
Carefully remove the patties from the crock-pot and place on a paper towel to drain. I did not have any fall apart on me, but I was very careful as I removed them.
Recipe by Couponing to Disney at https://www.couponingtodisney.com/kristins-kitchen-slow-cooker-hamburgers/