Soak beans in water about 8 hours. Overnight works well. You will need to cover the dried beans by at least a couple of inches of water because they will plump up. Discard the soaking water and rinse well.
If you can’t soak them, sometimes I forget, you can still make them. It will just take longer to cook.
Place beans in a large pot and cover with water by at least 1". Add onion, garlic, kombu, chipotle peppers, chili powder, oregano, and smoked paprika.
Stir, cover, and heat to boiling, turn the heat down to a simmer with cover slightly open. Cook for about 1 hour or until the beans are soft. To check, place a bean on a plate and smash with a spoon. If it is easy, they are cooked.
Remove the kombu, if desired.
Remove some of the liquid but save so that you can use it to thin the beans if necessary.
Blend with immersion blender or in a regular blender to desired consistency. Sometimes I make them fairly smooth and sometimes I leave them with more texture.
Add olive oil and salt to blended beans and place back in the original pot to heat through .