Prepare a grill for indirect medium heat (400°F to 425°F). If possible, have heat on either side of the cool zone. If this isn't possible, rotate the skillet once during grilling so that the cheese melts evenly.
Place the Brie round in a small cast iron skillet and set over indirect heat. Grill until the cheese is slightly puffed and very soft, 15 to 20 minutes.
During the last 2 minutes of cooking, place the bread slices over direct heat and toast for 1 to 2 minutes on each side.
Remove the cheese and bread from the grill. Drizzle the balsamic glaze over the cheese and top with cranberry relish. Serve immediately with toasted bread.
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Notes
Serve this immediately after grilling as the cheese will begin to firm up as it cools.
This recipe is suitable for gluten-free and vegetarian diets.