Put a pan over medium high heat.
When it gets hot, add cooking oil.
When oil is hot enough, put onions and ginger and saute until fragrant, about a minute.
Add the chicken pieces, sprinkle some salt and ground balck pepper to season it and cook until slightly browned.
Pour in coconut milk, (reserved about 1/4 cup) add some water ( about 1/3 cup).
Then add the papaya, season with fish sauce (start with a tablespoon).
Cover pan and let it boil then lower the heat and allow the dish to simmer until chicken and papaya are cooked and there's little coconut milk left.
Add chili leaves and the remaining coconut milk, let cook for a minute more or until the leaves are wilted.
Have a taste to check if the seasoning is to your liking.
Is it good? Then you're done. Serve with rice..lots of rice! :)