This hands-off, slow-cooker recipe has just a pound of ground beef and a can of stock. All the rest of the heft and taste comes from black beans, fire-roasted tomatoes, smoked paprika, chipotle peppers and corn tortillas.
In a medium skillet, toast cumin over medium-high until fragrant, about 1 minute. Add beef and onion to skillet. Cook and stir until beef is browned and onion is tender, about 6 minutes.
Transfer beef mixture to a 4- to 5-quart slow cooker. Add remaining ingredients (except toppers). Cover and cook on low 7 hours or on high 3 1/2 hours. Top as desired.