Preheat oven to 400 degrees. Line a cookie sheet with parchment paper. Cut your puff pastry into 6 rectangles. Move the cut pastry over to the cookie sheet, leaving a couple of inches of space between each pastry. With a fork, prick the center of each pastry, leaving about ½ inch space from all the edges.
In a bowl, mix together the strawberry jam and softened cream cheese. Divide the mixture evenly between the pastries. Spread the mixture evenly over the center of each of the pastries, leaving about ½ inch space from the edges of the pastry. Top with sliced strawberries.
Lightly brush the edges of the pastries with the melted butter. If you don't have a brush, you can dip a paper towel into the melted butter then brush along the edges of each pastry.
Bake the pastries at 400 degrees for 13-17 minutes, or until the pastries are puffed and golden. Remove from the oven and serve.