One of the ways I used up all of the extra Focaccia bread.
I sliced a piece in half and then topped with a mixture of sauteed hot Italian sausage, onion, bell pepper, celery, garlic, and hot peppers. While sauteing this, I added a splash of white wine vinegar, black pepper, and a little mixed seasoning.
I sprinkled mixed shredded cheese and some fresh chopped herbs (basil and rosemary) on top. Baked at 375 degrees Fahrenheit for 15 minutes or until the cheese melts. You could leave it like this or, as I did, throw a fried egg on top of each piece.