I use egg whites, since its my family's personal preference. They do not like the taste of too much egg yolks. You can use more egg whites or whole eggs. Instead of chillies, I use few red chilli flakes. Take the eggs, turmeric , pinch of salt and pepper in a bowl.
In a med-high hot skillet, add 2-3 tsp of butter/olive oil/coconut oil and saute the onion (abt 3/4 cup) along with little salt (eggs have salt, so adjust) until soft.
Add the tomatoes (abt 1 cup) and cook until soft.
Add the curry leaves and the beaten eggs to the onion-tomato mixture.
until well scrambled. Add the chopped cilantro and set aside.
I use the same pan to toast my Pavs. Add some more butter and when hot,
toast the pavs until warm and golden.