This chuck roast recipe is perfect for those who love bold and smoky flavors. Using a food processor, blend together coffee grounds, brown sugar, chili powder, cumin, and salt to create a rub. Rub the mixture all over the chuck roast and sear it in a hot skillet until browned on all sides. Transfer the roast to a slow cooker and add beef broth, onions, and bell peppers. Cook on low for 8 hours. The result is a tender and flavorful roast with a delicious coffee rub.