What common item can be customized with different fillings at Porto's?

The croissant is commonly recognized for its versatility in terms of fillings, which greatly enhances its popularity in various culinary contexts. At Porto's, croissants can be customized with a wide variety of fillings, such as ham and cheese, almond paste, or chocolate. This adaptability allows customers to select a flavor profile that suits their preference, making the croissant not just a pastry, but a personalized experience.

While other items like scones, muffins, and bagels do have some potential for variations, they are often more defined in flavor and texture. Scones typically emphasize sweet or savory components in a more fixed structure, muffins tend to have a specific flavor baked into them, and bagels generally adhere to classic toppings rather than custom fillings. Therefore, the croissant stands out as the item that is most widely customizable at Porto's.