Preheat the oven to 400 degrees. Line a cookie sheet with tinfoil.

Scrub the potatoes and then slice as thinly as you can (think potato chips). Lay them on the cookie sheet and drizzle the olive oil over the top. Toss to coat the potatoes with the oil, and salt and pepper generously to coat. Spread the potatoes evenly on the pan and then cook for 30-35 minutes, flipping them over halfway through. When they're tender, set them aside to cool for a few minutes and leave the oven on.

While the potatoes are cooling, put the diced bacon in a cast iron or other oven-proof skillet. Cook until slightly crispy, then drain the bacon bits on a paper towel, leaving the grease in the pan. Depending on how greasy your bacon was, you may want to drain a little out - I left about 3 Tablespoons of bacon grease in the pan.

Let it cool for a minute or two, then add the potatoes to the skillet and stir to coat. Sprinkle the bacon bits, the green onions and feta over the potatoes.

Whisk together the eggs, milk and salt, and pour over the potatoes. Cover the skillet with foil and bake for 15 minutes. Remove the foil and bake another 15 minutes more, until the eggs are set.

Serve warm.