Smoked Sausage with Onions and Mushrooms

1 pkg. Smoked Sausage, cut into bite size slices

12 oz. sliced mushrooms

1 onion, sliced

2 T. butter

 

Melt butter in a large skillet over med high heat.  Add remaining ingredients and sauté, stirring often until onions are tender and sausage is browned.