Preheat oven to 350F. Spray a 9 x 13-inch baking dish with cooking spray.
In a medium skillet, melt 1 Tablespoon butter over medium-high heat. In a small bowl combine 2 1/4 cups broth and flour, stirring until blended. Add to the skillet and bring to a boil. Boil for one minute until the gravy has thickened. Set aside.
In the same skillet, melt the remaining 2 Tablespoons butter. Add the onion, celery, apple and cranberries and cook until just softened, about 5 minutes, stirring occasionally.
Add the cubed stuffing and 3/4 cup chicken broth, stirring until the stuffing is moistened.
Slice the chicken breasts in half horizontally, but not completely through.
Place ½ cup stuffing on top of the cut side of the bottom half of each piece of chicken.
Bring the top half of the chicken over the stuffing to cover and season the tops of the chicken with kosher salt, pepper and paprika.
Arrange the chicken pieces in a single layer in the prepared baking dish. Spoon any additional stuffing around the chicken.
Pour the reserved gravy over the top of the chicken breasts.
Bake, covered, for 30 minutes.
Uncover and bake an additional 10 minutes or until the gravy is hot and bubbly and the chicken is cooked through.
Before serving, spoon some of the gravy over the tops of the chicken pieces.
Garnish with fresh parsley, if desired.