01 - Combine balsamic vinegar and honey in a small saucepan. Simmer over medium-low heat for 3–4 minutes, stirring frequently, until the mixture reduces to a syrupy consistency. Remove from heat and set aside to cool slightly.
02 - Spread 1 tablespoon of apricot preserves onto two slices of bread. Arrange Brie slices evenly over the preserves, then close each sandwich with the remaining bread slices.
03 - Generously spread softened butter on the outside of each sandwich, coating both top and bottom slices for an even golden crust.
04 - Heat a nonstick skillet or grill pan over medium heat. Place the sandwiches in the pan and cook for 3–4 minutes per side, pressing gently with a spatula, until the bread is golden brown and the Brie is fully melted.
05 - Transfer the sandwiches to a cutting board, slice each in half, and arrange on serving plates. Drizzle the balsamic reduction over the top and serve immediately.