Step 1: Prepare the Puff Pastry

1. Preheat your oven to 375°F (190°C). Grease a mini muffin tin or line it with cooking spray to prevent sticking.
2. On a lightly floured surface, roll out the puff pastry sheet to smooth out any creases. Cut the pastry into 24 equal squares, about 2.5 inches each.

Step 2: Assemble the Bites

1. Gently press each puff pastry square into the prepared mini muffin tin, creating a small cup.
2. Place a piece of Brie cheese in the center of each pastry cup.
3. Add a small spoonful of cranberry sauce on top of the Brie. Be careful not to overfill, as the filling will expand during baking.

Step 3: Add Toppings

1. If desired, sprinkle the tops with chopped pecans or walnuts for a nutty crunch.
2. Add a small pinch of fresh rosemary to each bite for a fragrant, earthy flavor.

Step 4: Bake the Bites

1. Bake in the preheated oven for 12-15 minutes, or until the puff pastry is golden brown and the Brie is melted and bubbly.
2. Remove from the oven and let the bites cool in the tin for 5 minutes before transferring them to a serving platter.

Step 5: Garnish and Serve

1. Drizzle the bites with honey or maple syrup for a touch of sweetness, if desired.
2. Serve warm, and enjoy the delicious combination of flavors and textures.