Heat a large heavy bottom pot or cast iron skillet on medium high. Add 2 tablespoons of the oil and add the roast and sear on each side about 2 minutes them flip and sear another 2 minutes. Remove and place roast in the slow cooker.
Add the beef broth, Thyme and rosemary
If you want to add potatoes to the slow cooker. Cut them into large chunks and add them about halfway into the cooking time to ensure they don't turn to mush.