The rice cooker you have is not an oven; it will never be suitable to cook the redbreast meat. You can try to bake this meat in a regular oven but we recommend you do not use your normal microwave instead, because that may cause other burns. So, if you want to eat this rare chicken, please don’t turn on the power of your rice cooker and let it stay like that for a long time after you finish cooking the chicken. The next day is fine!