Step 1

Set a rack in the middle of the oven and preheat to 400 degrees. In a small sauté pan, melt the butter over medium heat. Add the leeks, a splash of water and a pinch of salt and cook until the leeks are tender, about 2 minutes. Add the herbs and transfer to a 6-inch cazuela, cocotte or other ceramic dish, covering the bottom with the butter, leeks and herbs.

Step 2

Crack the egg into the middle of the dish. Add enough half-and-half to barely cover the white. Sprinkle with salt and coarsely ground pepper. Cook until the white is set, 8 to 12 minutes. Serve with grilled or toasted bread.