Preheat the oven to 375°F (190°C).

Place the wheel of brie into a small rectangular baking dish (such as a small Staub baker).

Arrange the chopped prosciutto and chopped apples around and slightly over the wheel of brie.

Spoon the apple butter generously over the top of the brie wheel, apples, and prosciutto.

Bake for 12 to 15 minutes, or until the cheese is melted and soft to the touch, the prosciutto has crisped up in the oven, and the apple butter is warm and bubbling.

Remove from the oven and garnish with chopped walnuts or fresh thyme leaves, if desired. Serve immediately with warm crostini, crackers, or fresh apple slices.