Place the chicken, butter, soup, and ionion powder in a slow cooker, and fill with enough water to cover.

Cover, cook for 5 to 6 hours on High.

About 30 minutes before serving, remove some of the liquid to make room for biscuit dough, then place it on top, it will expand, so watch to be sure it doesn't overflow.

Cook until the dough is no longer raw in the center.