Preheat oven to 400 degrees F. Line a baking sheet with parchment paper.

Lay puff pastry flat on prepared baking sheet and cut into 9 rectangles. Using your fingers, fold the puff pastry up slightly along the edges to make a rim.

Thinly slice the brie and lay slices evenly across puff pastry rectangles. Top with sliced peaches and a sprig of rosemary.

Bake about 20 minutes until pastry corners are puffed and golden brown. Let cool about 10 minutes and serve.