I found this recipe online somewhere and don't remember where. The filling is nice and gooey. I love how fontina cheese is so melty and mild. You can use any type of long bread. Sourdough is a good choice.
In small skillet, sauté onion in oil until soft, 3 to 4 minutes. In medium bowl, toss sautéed onions with peppers, parsley, thyme, fontina cheese and ham. Season to taste with salt and pepper.
To hollow rolls, cut off one end and set aside. Using a thin bladed knife, gently cut the center out of each bread, leaving 3/8 inches around the edge.
Use a small spoon to scrape out inside bread and discard. Stuff 1/4 filling mixture into the rolls by using the end of a wooden spoon to gently push filling into bread. Replace cut-off end and wrap each bread with foil, leaving open on top.
Place stuffed breads on baking sheet. Bake 10 to 15 minutes, until bread is crisp and filling is warm. Slice with a good serrated bread knife (so you don't smoosh it) and serve.