Crockpot Stuffed Peppers made with ground beef seasoned with Mexican spices, brown rice, black beans, and tomatoes are a quick dinner recipe that comes together easily. Cook in the slow cooker for an easy dinner recipe that needs little preparation. Change up the protein with either ground turkey, pork, or chicken. If you prefer low-carb, use cauliflower rice. Change up the protein to more beans if a vegetarian stuffed pepper is your choice.