In a heavy-bottomed skillet, cook the bacon until crispy. Transfer to a plate, let it cool down, and chop. Do not discard the drippings. Preheat the oven to 350 F.
Season the chicken cubes with salt, pepper, and poultry seasoning.
Brown the chicken cubes in the skillet with the bacon drippings. Transfer to a plate.
Cook the pasta according to package directions in a pot of boiling salted water. Save ½ cup of cooking water, drain, and return to the pot.
Add the pasta water, cooked chicken, cream of chicken soup, and one cup of shredded cheese. Mix well.
Place the chicken/pasta mixture into a 9x13-inch baking dish, sprinkle the rest of the shredded cheese and crumbled bacon on top, and bake for 20 minutes. Serve with sliced green onions on top.