Preheat oven to 400ºF.
Place a large skillet over medium-high heat with 2 turns of the pan of olive oil, about 2 tablespoons. Add the onion and garlic to the pan, and cook until tender, 4-5 minutes.
Add the leftover turkey, stuffing, potatoes and gravy to the pan, stir together and cook until heated through, 4-5 minutes.
Crack eggs over the top of the pan and transfer it to the oven. Bake until the eggs have just set (they should be like sunny-side up eggs), about 15 minutes. Garnish the finished cake with chopped herbs and serve warm.