1 pound fingerling potatoes
4 ounces slab bacon, cut into ¼-inch matchsticks
2 tablespoons Butter Olive Oil
2 tablespoons flour
1 cup whole milk
6 ounces grated gruyère (about 2 cups)
Salt and pepper to taste
Pinch freshly grated nutmeg
¼ cup finely-chopped chives
Preheat oven to 375 degrees. Cook potatoes by placing them in a pot of cold, heavily-salted water and bringing to a boil. Reduce heat to simmer potatoes until cooked through. Drain potatoes and, when cool enough to handle, slice lengthwise.
Add slab bacon to a cold pan and render over medium-low heat. Once crispy, remove bacon and drain on a paper towel-lined plate.
In same saucepan over medium heat add Butter Olive Oil, flour, and cook, whisking constantly, for about 3 minutes. While continuing to whisk, add milk and bring to boil. Reduce heat and add half of gruyère to sauce and stir. Season with salt, pepper, and nutmeg.
In a shallow baking dish or ovenproof skillet, gently combine potatoes, bacon, chives, and cheese sauce, then top with remaining gruyère. Bake for 30 minutes, or until cheese begins to brown. Remove casserole from oven and crack eggs over it. Return to oven and bake until eggs are cooked.