Can I use frozen spinach instead of fresh?
Yes. Use frozen chopped spinach and thaw it completely, then squeeze out excess moisture before adding to the casserole to prevent a watery dish.
Can I make this ahead of time?
Yes. Assemble the casserole in the dish, cover with foil, and refrigerate up to 24 hours. Add 10–15 minutes to the baking time if baking from cold.
What can I substitute for Gournay cheese?
Cream cheese or a similar soft spreadable cheese works well. Use the same amount by weight for comparable creaminess.
How do I know when the chicken is fully cooked?
The chicken is done when it reaches 165°F (74°C) at the thickest point. It should be opaque and shred easily with a fork.
Can I double this recipe?
Yes. Double all ingredients and use a 9x13-inch casserole dish. Increase baking time by 10–15 minutes, checking that chicken reaches 165°F internally.