Prepare, omitting the egg and using only ⅓ to ⅔ cup chicken stock or broth:
The stuffing should be just moist enough to hold together in a ball when squeezed firmly; do not overmoisten. Stir in:
Position a rack in the center of the oven. Preheat the oven to 350°F. Lightly oil a 13 × 9-inch baking pan.
Trim any fat around the edges of:
One at a time, place the chicken breasts between sheets of wax paper and pound with a mallet or a rolling pin until about ⅜ inch thick. Season both sides with:
Lay the breasts smooth side down on a work surface and place ¼ cup stuffing on the center of each chicken breast, pressing lightly to compact. Bring the ends of the chicken up over the stuffing. Lay the packets seam side down in the prepared baking pan and brush with:
Bake until the chicken is lightly browned and the internal temperature reaches 160°F, 20 to 30 minutes.