Frozen puff pastry makes it possible to bake an easy but elegant freeform tart at a moment’s notice. We roll the thawed pastry into a 10-by-14-inch rectangle before topping it and baking. By using fruits and ingredients with complementary flavors, we keep these simple desserts fresh and bright.

Fresh, juicy raspberries find a perfect match in creamy, lightly sweetened mascarpone cheese. You can use cream cheese in place of the mascarpone, but make sure it’s at room temperature so it combines easily with the egg and sugar.