Caramelized Red Onion & Dill Frittata with Smoked Salmon

Some of my favorite flavors come together in this recipe to create the ultimate frittata. Instead of cooking it in a frying pan, I use a springform pan, which allows for foolproof transferring to a serving dish. I always switch between using za’atar and chipotle chile powder to flavor this frittata (usually depends on who is eating it!). So here, I’m letting you choose between them.