While this recipe produces a tender, flaky, buttery crust, you can save time by purchasing a pre-made piecrust. If Swiss chard is not in season, substitute a box of frozen, chopped spinach that is thawed and squeezed dry. If your tart pan is smaller, you may have more filling than needed. Bake the remaining filling ingredients in a small custard dish that’s been sprayed with cooking spray for a crustless quiche.