Ensure your butter stays cold, as room temperature butter leads to a greasy crust rather than a light one in this Blueberry Danish Tart Recipe. Toss your blueberries with a teaspoon of cornstarch if they seem particularly juicy to prevent the base from becoming soggy. Use a pastry brush for the egg wash to get even browning, ensuring your Blueberry Danish Tart Recipe looks beautiful under the kitchen lights. Let the filling ingredients reach room temperature before mixing to achieve a silky consistency without needing heavy equipment. Rotate the tray halfway through the bake to compensate for hot spots in your home oven.