Making a spinach and feta omelette is simple and straightforward. Follow these step-by-step instructions to achieve omelette perfection:

1. Prepare the Ingredients:
   • Wash and chop the spinach leaves.
   • If using, finely chop the onion and mince the garlic.
2. Whisk the Eggs:
   • In a medium-sized bowl, crack the eggs and add salt, pepper, and milk or cream if desired.
   • Whisk the eggs thoroughly until they are well combined and slightly frothy.
3. Cook the Spinach:
   • Heat olive oil or butter in a non-stick skillet over medium heat.
   • Add the onion and garlic if using, and sauté until the onion is translucent.
   • Add the chopped spinach and cook until wilted, about 2-3 minutes. Remove from the skillet and set aside.
4. Cook the Omelette:
   • In the same skillet, pour in the egg mixture and let it cook on medium-low heat.
   • Gently stir the eggs with a spatula as they begin to set, pulling the edges toward the center and allowing uncooked egg to flow to the edges.
5. Add the Fillings:
   • Once the eggs are mostly set but still slightly runny on top, evenly distribute the cooked spinach and crumbled feta cheese over one half of the omelette.
6. Fold the Omelette:
   • Carefully fold the omelette in half over the fillings using a spatula.
   • Press down gently to seal and cook for another 1-2 minutes until the eggs are fully cooked and the cheese is melted.
7. Serve:
   • Slide the omelette onto a plate, cut in half if desired, and serve immediately for the best texture and flavor.