Wash the peppers thoroughly. Make a cut from top to bottom, to create two equal halves. Remove the seeds. Cook in boiling water for a few minutes, until soft. Reserve. Thinly slice the garlic and onion. Sauté in a pan with 1 tablespoon of oil. Add the diced chicken and sauté. Then add the mixture of the cooked rice and seasonings. Stuff the peppers with the mixture above and place them in a pan with 2 tablespoons of oil. If there is extra filling, arrange it in the pan next to the peppers. Bake in the oven for a few minutes, until browned.