Preheat oven to 400°F (200°C). Line a half sheet pan with parchment paper or a silicone liner.
Unfold the thawed puff pastry on a lightly floured surface. Roll just a bit to a thickness of about 1/8 inch.
Score the pastry about 3/4-inch from the edges all the way around. Be careful not to cut all the way through the pastry. Transfer the pastry to the prepared pan.
Using an electric mixer on medium speed, beat the cream cheese, sugar, and vanilla until thoroughly combined and smooth. Spread evenly on the pastry right up to the scored edges.
Place the berries on top of the cream cheese mixture, again right up to the scored edges.
Sprinkle the almonds over the berry mixture. If desired, sprinkle lightly with sanding sugar.
Bake 20 to 25 minutes, or until the pastry is golden brown.
If desired, serve with ice cream or sweetened whipped cream.