Onion Loaf with Cheese

A co-worker of mine made this for one of our lunches and it was so delicious and sounds easy to make!

1 loaf italian bread
1 onion, sliced thinly
1 stick butter
12-15 slices of swiss cheese

Cut bread length wise and then across as many times as you would like (thicker slices are recommended though). Saute the onions in about 1 tbsp of the butter, add the rest of the butter and melt. Place the cheese slices on the bread and then pour the butter mixture overtop. Cover with foil and bake for 30 mins. Uncover and bake another 15.