These slow-cooker bean and spinach enchiladas are a delicious and healthy twist on a classic Mexican dish. The enchiladas are filled with a flavorful mixture of black beans, spinach, and spices, and then topped with a homemade enchilada sauce and melted cheese. The slow-cooker method allows the flavors to meld together and the enchiladas to become tender and flavorful. Serve these enchiladas with a side of rice and guacamole for a complete and satisfying meal.