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Preheat oven to 375 degrees F.Put the rice in the bottom of a large casserole dish (2 qt.).
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Thinly slice the onion and mince the garlic.
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Heat oil in a large skillet over medium heat. Add the chicken thighs and saute until somewhat brown, about 2 to 3 minutes on each side. Transfer chicken to casserole.
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Add onion to the skillet and saute, stirring frquently, until softened, about 5 minutes.
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Add cinnamon, sugar and garlic and saute for a few seconds until you can smell the garlic. Transfer to the casserole.
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Deglaze the skillet with the chicken stock and pour over evrything in the casserole dish. Season well with salt and pepper.
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Cover and bake for 1 hour.
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Remove the chicken from the dish and mix the grapes into the rice. Replace the chicken and bake, covered, for another 10 minutes.
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Let stand for 15 minutes before serving.