To make baked brie, place one round of brie in the center of one sheet of thawed puff pastry. Spread 1/3 cup raspberry jam over the cheese, then sprinkle 2 tablespoons of walnuts over the jam. Fold the pastry over the brie to seal the openings, and bake at 350 degrees until brown. Fillings can be varied to suit one's taste.
There are many variations of brie baked in pastry, with combinations of preserves and nuts, including maple syrup and pecans, figs and walnuts, or pecans and brown sugar.
Baked brie can also be a savory appetizer. To make an onion and garlic appetizer, saute a sliced Granny Smith apple with a yellow onion in 1/4 cup butter. Place the brie on a sheet of thawed puff pastry, and top with onions and apple. Fold the pastry over the cheese and toppings, pinch closed and brush with butter. Bake at 400 degrees for 20 minutes.
Brie can be baked on its own. To make plain baked brie, remove the rind from the top of the round. Place the cheese cut side up in an oven-safe bowl. Bake at 350 degrees for 10 minutes. Top with cranberry sauce and bake for another 5 minutes. Sprinkle with walnuts, garnish with cloves of roasted garlic and serve.