This hearty casserole combines diced cooked chicken with sautéed celery, onion, and carrots in a rich creamy sauce made from cream of chicken soup, sour cream, and milk. Seasoned with garlic powder, thyme, salt, and pepper, the filling gets topped with a buttery seasoned stuffing mixture that crisps beautifully in the oven. The whole dish comes together in under an hour and serves six people generously.
The smell of celery and onions hitting hot butter still transports me to my grandmother's cramped kitchen, where she'd lean against the counter chatting while chopping vegetables. This casserole was her Sunday solution for leftover roast chicken, though she never measured anything and the stuffing was always somehow perfectly crisp. I've finally decoded her method after years of watching her cook by feel and memory.
Last winter my neighbor came over with a rotisserie chicken she wasn't going to finish, and we stood in my kitchen debating what to make. This casserole bubbled away in the oven while we caught up on six months of life, and by the time we pulled it out, her kids were already asking when they could eat again. Now she makes it every Sunday evening.
Ingredients
- 4 cups cooked chicken breast: Rotisserie chicken works beautifully here, or use leftover roast chicken
- 1 cup celery, finely chopped: This provides the essential aromatic backbone that makes the kitchen smell amazing
- 1 cup yellow onion, finely chopped: Don't rush the sauté, these should turn translucent and sweet
- 1 cup carrots, finely chopped: They add little pockets of sweetness throughout
- 1 can condensed cream of chicken soup: The base that holds everything together
- 1 cup sour cream: This is what makes the sauce tangy and rich instead of just salty
- 1/2 cup whole milk: Helps thin the sauce to the right consistency
- 1/2 teaspoon garlic powder: Don't skip this, it adds depth without being garlicky
- 1/2 teaspoon dried thyme: The herb that makes it taste like comfort
- 1/2 teaspoon black pepper: Freshly ground makes a noticeable difference
- 1/2 teaspoon salt: Adjust based on how seasoned your chicken already is
- 1 package seasoned stuffing mix: Use whatever brand your family always bought
- 1/2 cup unsalted butter, melted: This is what makes the top golden and irresistible
- 1 cup low-sodium chicken broth: Low-sodium is crucial since the stuffing mix is already salty
Instructions
- Get your oven ready:
- Preheat to 350°F and butter a 9x13 baking dish while the oven heats, so you're not scrambling later
- Soften the aromatics:
- Sauté the celery, onion, and carrots in a little butter or oil until they're fragrant and starting to turn translucent, about 5 minutes
- Make the creamy sauce:
- Whisk together the soup, sour cream, milk, garlic powder, thyme, pepper, and salt until completely smooth
- Bring it all together:
- Fold in the cooked chicken and sautéed vegetables until everything is evenly coated
- Spread and layer:
- Pour the chicken mixture into your prepared dish and press it down gently with a spoon
- Prepare the topping:
- Mix the stuffing with melted butter and chicken broth until every piece is moist but not soggy
- Top it off:
- Sprinkle the stuffing evenly across the chicken layer, covering it completely
- Bake until golden:
- Bake uncovered for 35 to 40 minutes until the top is deeply golden and you see bubbles around the edges
- Let it rest:
- Wait 5 to 10 minutes before serving, this helps the sauce set slightly so it's not too loose
My daughter requested this for her birthday dinner last year instead of going out, which I took as the highest possible compliment. She helped me make the topping, standing on her stool to carefully sprinkle each handful of stuffing.
Making It Your Own
Turkey works exactly as well as chicken, especially after Thanksgiving when everyone's tired of sandwiches. I've also added frozen peas directly to the chicken mixture when I needed to sneak in more vegetables, and nobody complained.
Timing Tricks
You can assemble the entire casserole up to a day ahead and keep it refrigerated, just add about 10 extra minutes to the baking time since it'll be cold. The vegetables can be chopped and stored in the fridge for two days ahead of time.
Serving Ideas
A simple green salad with vinaigrette cuts through the richness, and roasted green beans on the side make it feel like a proper Sunday dinner. Sometimes I just serve it with fruit for dessert and call it complete.
- Leftovers reheat beautifully in the microwave
- The top crisps up again under the broiler for a minute or two
- Portion into individual containers for easy work lunches
This is the kind of recipe that earns its place in your regular rotation not because it's fancy, but because it works every single time.
Recipe FAQs
- → Can I make this ahead of time?
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Yes, assemble the casserole up to 24 hours in advance and refrigerate. Add 5-10 minutes to the baking time if baking cold from the refrigerator.
- → Can I freeze this casserole?
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Freeze before baking by wrapping tightly in plastic and foil. Thaw overnight in the refrigerator then bake as directed, adding extra time if needed.
- → What type of chicken works best?
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Cooked rotisserie chicken, leftover roasted chicken, or poached chicken breasts all work perfectly. About 1 to 1.5 pounds yields the needed 4 cups.
- → Can I use homemade stuffing?
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Absolutely. Use about 3 cups of your own seasoned dried bread cubes mixed with herbs instead of the boxed stuffing mix.
- → How do I know when it's done?
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The casserole is ready when the stuffing top is golden brown and you see the creamy filling bubbling around the edges, typically after 35-40 minutes.