Slow cooker pot roast with onion sauce

Season the meat all over with the salt and pepper.
In a large skillet, heat the oil over medium-high heat. Add the roast and cook, turning occasionally, until browned on all sides, about 10 minutes total.
Place the roast in the slow cooker. Scatter the sliced mushrooms over the top.
In a medium bowl prepare the onion soup mix with the beef broth, and pour the mixture over the roast.
Cover the slow cooker, and cook on low for 8-10 hours or on high for 5-6 hours.
To serve, slice the meat, and serve it with the sauce spooned over the top.