Stir 1/4 cup reserved cooking liquid into bean mixture. (treehugger.com)
Pulse until a smooth mixture forms, adding reserved cooking liquid if necessary. (purplecarrot.com)
Add chicken, 3/4 cup of reserved cooking liquid, and chipotle to the tomato sauce and simmer, stirring occasionally, until thickened and excess liquid is almost completely evaporated, 10 to 15 minutes. (epicurious.com)