This is a hearty and versatile tomato and egg dish which is great for chilly mornings when you are not in a rush. The tomato base can be modified in many ways to get the flavors you want or to use up produce. While this recipe uses spinach, olives, and feta cheese, those are optional and other things may be used such as mushrooms, fresh basil, cream, honey, and/or different kinds of cheese. It also reheats well in the microwave, although to keep the egg somewhat runny, I will heat the sauce without the egg first, then add the egg and cook on medium power for only about 20 seconds more.
A full written recipe may be found here: https://cook.karylstein.com/g/family/r/shakshuka