Once the onion is starting to brown, approximately 5-8 minutes, add 1 can beans (drained and rinsed), 2 chipotles in adobo, 1 tablespoon adobo sauce, 1/2 teaspoon cumin, 1/2 teaspoon salt, freshly cracked black pepper, and 1/2 cup stock (or water). Let simmer for a few minutes until heated through and then add everything to a blender, combining well.