If cooking with a pre-cooked sausage, you will just want to reheat it quickly either in the microwave or oven, on the stovetop, or on the grill. If the chicken sausage is uncooked, it's important to follow the cooking instructions on the packaging, use a food thermometer to check for the correct internal temperature (usually around 165°F for chicken), and make sure the sausages are no longer pink in the center.