How to Make It
Roll pastry sheets into a 12-inch square on a lightly floured surface and place on ungreased baking sheets.
Brush pastry sheets with melted butter; top evenly with shaved butternut squash, leaving a 1/2-in. border. Brush squash with olive oil; sprinkle with kosher salt and black pepper.
Bake at 400°F for 20 minutes. Remove from oven and cut baked puff pastry sheets into triangles; drizzle with balsamic glaze and sprinkle with shaved ricotta salata.