Drizzle olive oil into a wide Dutch oven set over medium (4/10 heat). Season the chicken pieces with a sprinkle of the kosher salt and pepper, then taking about one-quarter of the pieces at a time (so they fit in the frying pan in a single layer without crowding), sauté until lightly browned on all sides. Once each portion is browned, set off to the side in a bowl or plate.
When all the chicken is browned, preheat the oven to 325°F/160°C, adjusting the rack(s) to the bottom and middle. The rack in the middle of the oven needs enough room above it to hold the covered Dutch oven.
Add the tablespoon olive oil, diced onions, garlic, ground coriander to the Dutch oven (no need to clean it between chicken and onions). Stirring occasionally, cook over gentle heat until the onions soften, about 20 minutes. Add the sweet paprika, lemon zest, honey, chili flakes, then continue to stir over the heat another 1-2 minutes.
Pour the spiced onion mixture over the chicken pieces in the Dutch oven and stir well to distribute. Pour in the tomatoes, then the chicken broth*, using a little of the broth to "rinse out" the tomato cans of any clinging tomato stuck to the bottom. The meat should be just covered by the liquid. Add the cinnamon sticks and lemon juice, then stir carefully to combine.
Place the Dutch oven over high heat and bring the liquid to a boil. Once the liquid boils, cover the Dutch oven, then place it in the pre-heated oven. Cook for 45 minutes, checking occasionally (every 20 minutes-ish) to ensure the meat is still covered by liquid and adding more chicken broth (or water) if it is not.
Remove the Dutch oven from the oven, remove the lid, and pour in the uncooked orzo pasta.*** Stir to combine, then return the pot to the oven (uncovered) for another 25 minutes, at which point the orzo should be very tender. Stir in any greens you might want to add, like baby spinach leaves or petit peas. The heat from the stew will wilt them.
If using halloumi, ten to fifteen minutes after adding the orzo, slice the halloumi and fry it (you can use the same frying pan or a smaller one) until golden brown on both sides, about 5 minutes per side.
Once the chicken and orzo are tender, add a little more chicken broth to loosen up the sauce if necessary.
Serve the chicken baked with orzo immediately, with a couple slices of the sliced fried halloumi on top of each serving.