Preheat your oven to 375°F (190°C).
Place a cast-iron skillet over medium heat.
Add the bacon and cook until crispy.
Remove bacon and place on a paper towel. Chop once cooled.
Leave about 1 tablespoon of bacon fat in the skillet.
Add spinach and cook for 30–60 seconds until wilted.
In a bowl, crack the eggs and whisk lightly.
Add salt, pepper, cheese, and chopped bacon to the eggs.
Pour the egg mixture into the skillet with spinach.
Stir gently once to spread ingredients evenly.
Transfer the skillet to the oven.
Bake for 12–15 minutes until the center is just set.
Remove from oven and let rest for 5 minutes before slicing.
