Preheat the oven to 350F. In a small skillet, toast pecan halves in butter over medium heat until fragrant; add brown sugar and maple syrup and bring to a boil. Cook, stirring, for a minute, then remove from the heat.
Meanwhile, place a small wheel or wedge of brie or La Rougette on a foil-lined baking sheet and bake for 5-8 minutes, or until soft. Carefully transfer to a serving plate and cover with pecan praline. Serve warm, with a baguette.