Just chop 1 cup of walnuts (depending on the size of brie you need to cover) and stir into 1 cup crumbled blue cheese. Press onto the top of the brie and carefully wrap a sheet of thawed puff pastry dough (Roll out to size needed).
Use fingers wet with cold water to seal underside of pastry. Cut off excess to make cut-outs and adhere to top of brie with a little cold water.
I refrigerate my brie at this point until I''m ready to bake.
Remove from fridge, Brush w/egg wash (1 egg beaten with a Tbsp. cold water) and bake on a cookie sheet covered with baking parchment in a 375 degree oven for about 20 minutes until golden. (Parchment makes it simple to transfer brie to serving dish.)
Let Baked Brie stand for 20-30 Min. before cutting to let it firm up a little.