Preheat the broiler. Line a baking sheet with foil.
Arrange the baguette slices on the prepared baking sheet. Cut the Brie into 1/4-inch-thick slices and put 1 slice on each piece of baguette. Broil until the cheese is melted, 1 to 2 minutes.
Drizzle the toasts with the honey and then top with some prosciutto and a sprinkle of thyme leaves if using.
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