Simple Hot Dogs and Beans

I don't make this often, but my daughter is always happy when I do!

1 package hot dogs
1 tbsp butter
1/4 c chopped onion (optional)
2 cans pork & beans
2 tbsp ketchup
2 tbsp mustard
2 tbsp brown sugar
1 tsp Worcestershire sauce
Mozzarella cheese, shredded

Melt butter in a skillet. Meanwhile, slice hot dogs. Brown hot dogs in butter. If I use onion as well, I add it in with the hot dogs. When hot dogs are browned, stir in beans, ketchup, mustard, brown sugar and Worcestershire sauce. Heat through. Sprinkle with mozzarella before serving.