1 lg. pkg. potatoes O'Brien, lightly browned
1 c. shredded Monterey Jack cheese
1 lb. ham, shaved and lightly browned
18 eggs
1 (8 oz.) can mushrooms
1/2 c. shredded American cheese

In 9 x 13 inch baking dish layer in order: potatoes, Monterey Jack cheese, and ham. Set aside. Lightly scramble eggs, mushrooms and American cheese. Spoon egg mixture carefully into baking dish and bake at 375 degrees for 35 to 45 minutes.