Preheat oven 350 degrees.

In a large skillet brown ground beef. Drain off fat.

Prepare mashed potatoes and set aside. (If using instant potatoes prepare per box instructions).  

*Peel potatoes, cut into slices and place in large pan of water. Boil until potatoes are tender.

*Drain water in sink and return cooked potatoes to pan.

*Add butter, sour cream and milk and mash potatoes until smooth (use a potato masher or for smoother potatoes use a hand mixer).

Place cooked beef in 9" square baker.

Drain green beans and add to top of beef. Salt and pepper to taste.

Pour mushroom soup straight out of the can on top of green beans and smooth out.

Carefully spoon mashed potatoes on top of soup and smooth out. 

Place 9" baker on a cookie sheet in case it should boil over while baking.

Bake for 45 minutes or until potatoes are slightly brown.

Remove from oven and allow to cool for 15-20 minutes prior to serving.

Enjoy!