This recipe makes enough to serve four to six people, so a basic 4-quart slow cooker is just fine. If you want to double it and have more features like being able to program it, I love the Hamilton Beach Programmable 6-Quart Slow Cooker. And I know the slow cooker purists are crying "foul" on me because I brown the meat on the stove. But really, it is super fast. And if you have an Instant Pot, you can brown the meat right in there and then use the slow cooker setting to finish off the chili.