Toast Walnuts: Preheat oven to 400°F. Toast chopped walnuts for 6-8 minutes on a dry sheet until golden. Let cool.
Prep Pastry: Roll cold puff pastry lightly on a floured surface into a 12-inch square.
Wrap Brie: Place brie wheel in the exact center. Fold pastry up and over brie, pressing seams firmly. Flip seam-side down onto parchment-lined baking sheet.
Egg Wash: Brush entire pastry surface with egg wash. Wait 2 minutes and apply a second coat.
Bake: Bake at 400°F for 20-25 minutes until deep golden brown throughout.
Rest: Rest for 5 minutes before cutting or transferring.
Top & Serve: Top with toasted walnuts, dried cranberries, a slow honey drizzle, and fresh thyme. Serve immediately.