Heat the oil in a large skillet over medium-high heat.
Add pork chops and brown on both sides (you don't need to cook them all the way through—they just need to be nicely browned on the outside), about 2 minutes per side.
Transfer the browned chops to a slow cooker. Add the sliced onions to the skillet and cook until nicely browned, about 5 minutes. Place them on top of the pork chops in the slow cooker.
Add chicken broth and wine to the skillet and whisk up all of the browned bits from the bottom of the pan. Pour liquid over pork chops and onions. Cover and cook on LOW for about 8 hours. Serve hot and enjoy!