Heat the oven to 450 degrees F.
Separate each hoagie roll into halves. Cut each half into 4 slices, for a total of 16 slices. Butter each side of the slices and put them onto a baking sheet.
Spread 1 tablespoon of apple butter onto each slice.
Top with 1 slice of prosciutto and 3 or 4 slices of pear or apple.
Cover with the Brie slices, season with salt and pepper, and drizzle with olive oil.
Bake until the cheese is melted, about 8 to 10 minutes.