Chipotle chilies in adobo sauce give these quick and easy refried beans smoky notes and moderate spiciness. Pinto beans are slightly sweeter and creamier than black beans, but either works well. If you prefer a perfectly smooth texture, puree the beans in a food processor instead of mashing them by hand. Serve as part of a Mexican or Tex-Mex meal or use to make simple yet delicious bean and cheese tacos.