A slow cooker is certainly convenient, but if not used correctly there is the potential for food-safety hazards. Temperatures between 40° and 140°F fall into the so-called “Danger Zone,” since bacteria thrive in these temperatures. When using a slow cooker be sure to take precautions that keep food from being in the Danger Zone for too long. To avoid the Danger Zone, never add frozen ingredients to your cooker, refrigerate any ingredients you’ve prepped ahead in separate storage containers and bring liquids to a simmer if you’re cooking on Low before adding them to your cooker to give the heating process a jump-start. Never attempt to cook a whole chicken or roast in your slow cooker: large hunks of meat won’t cook thoroughly enough in the slow cooker. So when cooking with meat, make sure it’s cut into smaller pieces that will cook throughout.