Heat a large nonstick skillet over high heat, spray with cooking spray. Season roast with salt and pepper. Add roast and sear until browned on all sides, about 3 to 4 minutes per side ~ This is very important for a good flavor.
Transfer beef to slow cooker, insert oven safe thermometer into thickest part of roast.
Cover and cook to 135 degrees for medium rare, 140 degrees for medium, ABOUT 1 – 2 hours.
Save drippings in slow cooker.
Remove and let rest for 20 – 30 minutes (this will keep the juices in).
Slice across the grain.