Leek Frittata

Directions

1. 1
   In a 10-inch ovenproof, nonstick skillet, heat oil over medium heat.
2. 2
   Saute guanciale until golden brown, about 3 to 4 minutes.
3. 3
   Add leeks and cook until soft, about 5 minutes.
4. 4
   Add thyme.
5. 5
   Transfer to a plate; set aside.
6. 6
   Preheat oven to 375 degrees F. Return skillet to medium-low heat.
7. 7
   In a large bowl, whisk eggs, milk, and cheeses; season with salt and pepper; and stir in reserved leek mixture.
8. 8
   Pour into pan and cook until frittata sets around edges, about 5 minutes.
9. 9
   Transfer pan to oven and cook for 15 minutes more.