If you're looking to slow cook in an electric roaster, there are a few things you'll need to keep in mind. First, you'll want to make sure that your roaster is set to the correct temperature. For slow cooking, you'll want to set the roaster between 200 and 250 degrees Fahrenheit. Next, you'll need to add your food to the roaster. Make sure that whatever you're cooking is evenly distributed in the roaster so that it cooks evenly. Finally, once your food is in the roaster, put on the lid and let it cook! Depending on what you're cooking, it could take anywhere from 4-8 hours for your food to be ready. Just check on it periodically throughout the cooking process to make sure everything is going according to plan.