On a visit to Chicago several years ago, my friend Kalyn and I made a pilgrimage to The Spice House. We met the owner, Patricia Penzey Erd (yes, of that Penzeys family), and discovered many wonderful new-to-us herbs and spices. I bought some Greektown "Billygoat" Seasoning, probably because of the wacky name, and I've become unabashedly addicted to it. (Go to The Spice House web site to learn about the Billy Goat.) Greek seasoning combines the Mediterranean flavors of oregano, lemon peel, salt and pepper, onion and garlic. You might not think of it as a natural with your morning eggs, but in this breakfast casserole recipe, with sharp feta cheese, mild artichoke hearts, and earthy spinach, the Greek seasoning brings just the right amount of emphasis to the dish. As good as this egg casserole is to start your day, it's even better for a light supper, paired with some crusty bread.