Meanwhile, heat oil in a large skillet over medium-high heat. Add ground beef and scallion whites. Cook, stirring and breaking up the beef with a wooden spoon, until it is no longer pink, about 4 minutes. Add tomato paste, chipotles to taste, paprika, and salt. Cook, stirring, until the tomato paste begins to brown, about 1 minute. Add beans and water; cook, stirring, until most of the liquid has evaporated, about 1 minute more. Cover and keep warm.