Chop onion and bell pepper and put in a bowl. Peel and slice potatoes into the bowl with the onion and pepper and mix them together. In a small bowl mix Worcestershire sauce and season all for later.
In a baking dish put a layer of potatoes, onion, and pepper, sprinkling a little bit of salt on top. Put a layer of shredded cheese on top of the potatoes. On top of the cheese put some of the Worcestershire sauce mix. Keep layering until all potatoes are used. Put pats of butter around on the top of the potatoes. Cover with lid or foil.