Preheat oven to 200 C (390 F) and line a mini muffin tray with paper muffin cups.
Mix eggs and flour together in a mixing bowl.
Add spinach and half of the cheese (so 1/4 cup) and mix to combine.
Spoon the mixture into the prepared muffin tray, filling each cup about 3/4 full.
Sprinkle the remaining 1/4 cup of cheese on the top of the muffins.
Bake for 12-14 minutes, or until golden on top.
Makes 12-18 (depending on the size of your mini muffin tray cavities).