If you are baking the pastries with the filling, they are best eaten by the next day, storing any left overs in your fridge. If you are adding the cream after baking, the baked pastries themselves without any filling can last in an air tight container at cool room temperature for up to 2 days, at their best. Once ready to eat, fill with cold pastry cream filling, top with berries and dust with confectioner sugar before serving.