Slice the green chilies lengthwise. You can remove the seeds if you prefer a milder dish.
Thinly slice the onion and mince the garlic.
Chop the tomatoes.
In a large pot or saucepan, melt the butter over medium heat.
Add the sliced onions and minced garlic. Sauté until the onions are soft and translucent.
Add the chopped tomatoes and sliced chilies to the pot. Stir well to combine.
Pour in the water and bring the mixture to a boil.
Reduce the heat to low and let it simmer for about 10-15 minutes, or until the chilies are tender.
Add the crumbled or grated feta cheese to the pot. Stir gently to combine.
Continue to cook for another 5-10 minutes, or until the cheese has melted and the mixture is creamy.
Season with salt to taste.
Enjoy your meal!