Heat the oil in a large pot over medium heat. When it shimmers, add the onions
, and garlic and cook for a few minutes to soften. Add the beans, oregano
, and spices of your choice. Season with salt and pepper, to taste, and cook, stirring frequently, until you can smell all your spices
. Add the tomatoes with juices, water, and cilantro
, and bring to a boil. Reduce the heat to low and simmer
until slightly thickened, about 30 minutes. Season, to taste, with salt and pepper, if needed. Transfer to a large serving bowl and serve with avocado
, sour cream
, and cheese.