Preheat oven to 400°. On a lightly floured surface, roll puff pastry to a 10-in. square; cut into 12 rectangles (approx. 3x2-1/2 in.). Place on ungreased baking sheets. Bake until golden brown, 12-15 minutes. Remove to wire racks; cool completely., In a large bowl, toss strawberries with 1/4 cup sugar. Let stand 30 minutes, stirring occasionally. In another bowl, beat cream until it begins to thicken. Add vanilla and remaining sugar; beat until stiff peaks form., To serve, split pastries horizontally in half. Top each bottom half with 2 tablespoons whipped cream and 1 tablespoon strawberries; replace top half. Top with remaining whipped cream and strawberries.