Preheat oven to 400ºF (200ºC), and prepare two cookie sheets with parchment paper. In a bowl, mix cream cheese, sugar, and vanilla until fully combined. Lightly flour the surface and roll out puff pastry on top to flatten. Cut each sheet of puff pastry into 9 equal squares. On the top right and bottom left of the pastry, cut an L shape approximately ½ inch (1 cm) from the edge.
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NOTE: This L shape should reach all the way down and across the square, however both L shapes should not meet at the ends. Your pastry should look like a picture frame with two corners still intact.
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Take the upper right corner and fold down towards the inner bottom corner. You will now have a diamond shape.
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Place 1 to 2 teaspoons of the cream cheese filling in the middle, then place berries on top.
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Repeat with the remaining pastry squares and place them onto the parchment covered baking sheet.
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Bake for 15-20 minutes or until pastry is golden brown and puffed.