In front of the Paoay Church is Herencia Cafe which first served the Pinakbet Pizza, topped with your usual pinakbet vegetables. We also got to try the Bagnet Pizza which is crispy bagnet or lechon kawali (chicharon as they sometimes refer to it in Ilocos) on a pizza, and the Dinuguan Pizza (dinuguan with crispy bagnet).
Further north is Saramsam Restaurant in Laoag. Their specialty is the Poque-Poque Pizza which is topped with poque-poque or poki-poki, an Ilocano eggplant dish (combination of eggplant, tomatoes, onions ang egg). This is really good!
We also got to try Dinardaraan Pizza, their version of the Dinuguan Pizza, which is dinuguan topped with green chili peppers. Another of my favorites is the Longaniza Pizza topped with the local Laoag longaniza. They also have Carbonara Pizza topped with Currimao oysters. But I was not able to try that out.
There are actually more pizzas to choose from but of foreign influence. So you could just try them out when you're there. These Ilocano pizzas are superb!