Method:
In a medium skillet, melt butter over low heat. Add apple slices and sauté, turning often, until nicely browned and tender, 10 to 15 minutes. Set aside to cool.
Preheat oven to 350°F. Lay a sheet of puff pastry flat on a non-stick or parchment-lined baking sheet or pie pan. Slice wheel of Brie in half horizontally to create two thinner Brie rounds. Place one Brie round (rind-side down) on the pastry dough. In a small bowl, mix together apples, cranberries and Calvados. Spread this mixture evenly over the Brie. Place other Brie round (rind-side up) over filling. Fold pastry edges up over Brie and press together to seal. Flip entire package so that the seam is underneath. Brush the top with egg wash.
Bake 15 to 20 minutes, until pastry is golden brown. Let cool 5 minutes before serving. Garnish with toasted almonds if desired.