Slow Cooker Beef Stroganoff

This is one of my favorite things to make in the slow cooker. It is so full of flavor and creamy and just YUM. I know Beef Stroganoff typically has mushrooms in it, but I don't like them, so I leave them out. If you'd rather yours have mushrooms, add in a drained, 6 oz. container of sliced mushrooms in when you are beginning.