Preheat oven to 350°F.
Place the scored quarter-wheel of Le Campagnier into a small baking dish (with parchment paper if you plan to move it to a different plate), spread the top with half of the fig jam and then loosely cover.
Bake for 15 minutes, or until warmed through and very melty. (if you want it oozing, you can add another few minutes to the bake time–which is exactly how I like it).
Remove from the oven. Top with remaining fig jam, chopped nuts, and crispy prosciutto.
Serve immediately with breads, crackers, crostini, apple slices, or your favorite dippers.