Optional step, season and sear chicken cutlets and vegetables first. Heat a tablespoon of oil in a skillet on medium-high heat and sear 1-2 minutes per side. Remove from the skillet.
In the same skillet on medium-high heat, sauté the chopped vegetables, 2-3 minutes.
Lightly grease the inside of your crockpot with butter or non-stick cooking spray.
Place the chicken in the bottom of the crockpot in a single layer. If not previously seasoned with salt and pepper before searing, add amount as desired.
Evenly disperse vegetables on top, if using.
In a mixing bowl, combine the condensed cream of chicken soup, condensed cream of celery soup, poultry seasoning, and ½ cup of the chicken broth. Mix well until smooth.
Pour the soup mixture evenly over the vegetables and chicken in the crockpot.
In a separate bowl, mix together the stuffing mix. melted butter, and remaining chicken broth. Spread the stuffing mixture evenly over the soup mixture in the crockpot.
Cover and cook on low heat for 6-8 hours or on high heat for 3-4 hours, or until the chicken is cooked through and the stuffing is cooked and slightly crisp on top.
Once the chicken and stuffing casserole is done cooking, you can serve it directly from the crockpot.