Start by finely chopping the onion and celery.

In a skillet over medium heat, melt two tablespoons of butter until bubbly. Add the chopped onion and celery, sautéing for about 5 minutes.

Place the seasoned boneless chicken breasts into the bottom of the slow cooker, laid flat.

In a mixing bowl, combine the stuffing mix with the sautéed onion and celery, followed by the chicken broth. Stir until the stuffing is evenly moistened.

Spread the stuffing mixture over the chicken breasts in the slow cooker, ensuring the chicken is fully covered.

Cover the slow cooker with its lid and set it to cook on low for 6-8 hours or on high for 4 hours.

Once done, gently fluff the stuffing with a fork and serve alongside your favorite side vegetables or crusty bread.