01 -
Preheat oven to 175°C and grease a 12-cup muffin tin with butter or olive oil. Using a silicone muffin tin is recommended for easier removal.
02 -
In a large bowl, crack eggs and whisk until uniform. Add sea salt and ground black pepper, then whisk to blend flavors.
03 -
Fold the roughly chopped spinach into the egg mixture and whisk gently to distribute evenly.
04 -
Pour the egg and spinach mixture evenly into muffin cups, filling each approximately halfway. Sprinkle crumbled feta cheese atop each portion.
05 -
Place the muffin tin in the preheated oven and bake for 18 to 20 minutes until the centers are fully set.
06 -
Serve the muffins immediately or refrigerate in an airtight container for up to five days.