Pat chicken dry with paper towels. Mix cinnamon, salt and pepper in a small bowl, then rub all over the chicken pieces.
Using a deep, 12" wide skillet, heat the oil until it shimmers (if you have a smaller pan, make 2 batches, using half the oil for each). Add the chicken pieces, being careful not to overcrowd, and cook until very brown, 4-5 min per side.
Mince 3 cloves of garlic. Reduce heat to medium-high and add minced garlic and onions. Saute until onions soften and begin to brown, about 5 minute Deglaze with 1/2 c water or broth, using a wooden spoon to scrape up any browned bits from the bottom of the pan.
When the deglazing liquid has evaporated to nearly dry, add the remaining 1 1/2 c water or stock, the tomato paste, the Italian seasoning and the remaining 2 cloves of garlic, minced.
Return the chicken to the pan, nestling it down in the sauce. If the sauce does not come 3/4 of the way up the side of the chicken pieces, add more water or broth. Cover and simmer over medium-high heat until tender, about 30-40 minutes. Season the sauce with salt and pepper. Sprinkle with Parmesan cheese. Serve with cooked orzo or rice.