Can I use bone-in chicken breasts instead of boneless?
Yes, but increase baking time by 10–15 minutes and check internal temperature reaches 165°F. Bone-in pieces will stay even more moist.
How do I prevent the stuffing topping from drying out?
Toss the stuffing mix with melted butter and broth just before adding it to the casserole, then cover loosely with foil for the first 25 minutes of baking.
Can this casserole be made ahead?
Assemble completely up to 24 hours ahead, cover, and refrigerate. Add 10–15 minutes to baking time if baking from cold.
What if I don't have sour cream?
Substitute Greek yogurt or heavy cream for a slightly thinner sauce, or use cream cheese thinned with milk for richer flavor.
How do I know when the chicken is done?
Insert a meat thermometer into the thickest part of the largest breast; it should read 165°F. Chicken is safe to eat at that temperature.