Get your family's favorite steakhouse sandwich on your menu with roast beef with mushroom and onions and topped with melted Cheddar on a hearty sub roll.
This hearty and flavorful soup is so easy to make...simply mix the ingredients in a slow cooker and let it do the work for you. And to make it even better, stir in Cheddar just before serving and top with a sprinkle of chives.