Season the meat on both sides with salt, pepper, and onion powder.
Set a large skillet over medium high heat. When the pan is hot add the oil. Brown the meat on all sides. Add the meat to the slow cooker
Sprinkle over the au jus and pour over the water (just one cup).
Cook on LOW for 8-10 hours.
Shred the meat, discard any fat. I do this on a plate, then cover with foil until ready to serve. Degrease the au jus in the crockpot by laying a paper towel over the grease and removing quickly. Add more water to the au jus if you don't have enough for serving.
Pile meat on buns, hoagie or french bread, add cheese.
Melt the cheese under the broiler in the oven.
Serve the french dips with the freshly prepared au jus