Prep Time 15 minutes mins
Cook Time 15 minutes mins
Total Time 30 minutes mins
Keep the pastry cold until it hits the hot oven; if the squares feel sticky on a humid day, chill the whole tray for 10 minutes. Do not oversauce — one level teaspoon per square is the difference between flaky and soggy. Assemble ahead: cover and refrigerate up to 24 hours, or freeze solid and bake from frozen at 400°F for 18 to 20 minutes. Reheat baked leftovers at 375°F for about 5 minutes on a wire rack.