Rinse the rice and soak it for about 5 minutes to eliminate any excess starch.
In a small pot, bring the rice to a boil for roughly 5 minutes, until it's just beginning to soften. Once the rice is cooked, drain it and put aside.
Wash all peppers and slice off the tops. Carefully remove the seeds from inside, ensuring the peppers are ready to be stuffed.
Chop finely onion and garlic. Add a table spoon of vegetable oil to the preheated skillet and fry the chopped onions and garlic until golden brown. Set aside.
Put the ground chicken in a bowl, season it with salt and freshly ground black pepper, then mash it well with a fork to ensure it's nicely blended.
Heat a skillet, add a table spoon of vegetable oil, reduce the heat to medium, and cook the seasoned meat for about 10 minutes until it's cooked through. Add ground coriander while cooking.
Mix the cooked meat with the drained rice and fried onion and garlic. Now your filling is ready.
Stuff the peppers with this filling.
Melt butter in a large pot or casserole dish. Stand stuffed peppers upright. Add 1 cup of boiled hot water and top your peppers with sauce.
Cook over medium heat for about 40 minutes or until the peppers are fork-tender.
Serve hot or warm. Enjoy!