Start by rinsing the dried pinto beans in cold water to remove any dirt or debris. Sort through the beans to remove any stones or shriveled beans.
In your Instant Pot, combine the rinsed pinto beans, water, sea salt, chili powder, ground cumin, dried Mexican oregano, and freshly ground black pepper. Stir gently to combine.
Secure the lid on your Instant Pot, ensuring that the valve is set to the sealing position.
Set the Instant Pot to manual mode and adjust the cooking time to 30 minutes at high pressure. Allow for a natural pressure release for about 15 minutes before switching to quick release for any remaining pressure.
Once the pressure is fully released, carefully open the lid and check the beans for doneness. They should be tender but not mushy. If they need more time, reseal the lid and cook for an additional 5 minutes.
Once the beans are cooked to your liking, serve them hot. Squeeze fresh lime juice over the top and garnish with chopped fresh cilantro. Enjoy as a side dish or in your favorite recipes!