To make spinach omelette, heat the oil in a non stick pan. Fry the finely chopped onions, spinach, garlic greens (or spring onions) and chillies for 3-4 minutes on a high flame.
Meanwhile, crack the eggs in a bowl. Add the milk, black pepper and salt and whisk until you get a smooth mixture.
Combine the sauteed greens mixture into the eggs, whisking it in quickly.
Pour this mixture in the same pan and allow to cook on a medium heat. Once it looks nearly set, carefully turn it over to cook the other side.
Use two spatulas to help turn the spinach omelette over. Or else, turn the omelette over into a dish and then slide it back into the pan to cook the other side.
Serve hot as it is or with toast.