Add the beans, onion, garlic, oregano, cumin, dried chile and stock/water to your slow cooker. Give it a stir.
Cook on high heat for 4-5 hours, or low heat for 8-10.
When the beans are tender and most of the liquid has evaporated, remove the dried chile if you aren't a fan of spicy food, or keep it and mix the softened chile into the beans for additional flavor and heat.
Add the lime juice and salt. Mix well.
Optionally garnish with fresh chopped cilantro before serving. Enjoy!