Preheat the oven to 200°C (400°F).
In a 9-inch oven-safe skillet or baking dish, toss the spinach, cherry tomatoes, and minced garlic with olive oil until coated.
Distribute the crumbled feta cheese evenly over the vegetable base.
Place the dish in the oven and bake for 10 minutes until the spinach has wilted and the tomatoes begin to burst.
Remove the dish from the oven and use a spoon to create four small indentations in the mixture.
Carefully crack one egg into each indentation.
Season the tops of the eggs with oregano, red pepper flakes, salt, and black pepper.
Return the dish to the oven and bake for an additional 8 to 12 minutes, or until the whites are fully set but the yolks remain slightly soft.
Remove from the oven and let rest for 2 minutes before serving.