Pin It This hearty baked casserole combines tender chunks of cooked chicken with fluffy russet potatoes and vibrant broccoli florets, all bound together in a rich, creamy sauce made with sour cream, milk, and sharp cheddar cheese. The dish comes together easily—simply boil the potatoes until fork-tender, steam the broccoli until bright green, then toss everything with the cheesy mixture and bake until golden and bubbly.
Seasoned with paprika, dried thyme, garlic, and onion, this American-style main dish delivers satisfying comfort food that's naturally gluten-free when made with certified ingredients. The finished casserole develops a beautifully golden cheese crust while the interior remains creamy and indulgent.
The first time I made this casserole was during a particularly brutal February when my apartment heat was barely working. Something about that bubbling cheese and the way the kitchen warmed up felt like a hug I desperately needed. My roommate walked in mid-bake, announced she was staying for dinner, and sat on the counter watching the cheese brown through the oven door.
Last winter my sister called crying about her terrible day at work. I told her to come over, put this casserole in the oven, and by the time she walked through the door, the whole apartment smelled like comfort. She ate two helpings straight from the baking dish and actually forgot why she was upset halfway through.
Ingredients
- 2 cups cooked chicken breast: Rotisserie chicken works beautifully here and saves so much time
- 4 medium russet potatoes: Dice them evenly so everything cooks at the same rate
- 2 cups broccoli florets: Fresh keeps its texture better than frozen, though frozen works in a pinch
- 1 small onion: The sweetness balances all that creamy dairy perfectly
- 2 cloves garlic: Minced fresh, nothing compares to that punch
- 1 cup sour cream: Full fat is worth it here, seriously
- 1 cup shredded cheddar cheese: Plus extra for topping because cheese crust is non-negotiable
- ½ cup milk: Whole milk creates the silkiest sauce
- 2 tablespoons unsalted butter: Melted into the sauce for richness
- 1 teaspoon salt: Adjust based on whether your chicken was pre-seasoned
- ½ teaspoon black pepper: Freshly cracked makes a difference
- ½ teaspoon paprika: Adds a subtle warmth without heat
- ½ teaspoon dried thyme: Earthy and pairs so well with broccoli
Instructions
- Preheat and prep:
- Get your oven to 400°F and give a 9x13 baking dish a quick coating of butter or oil
- Par-cook the potatoes:
- Boil those diced russets for about 8 minutes until they surrender to a fork but are not falling apart
- Blanch the broccoli:
- Steam florets for just 3 or 4 minutes until they turn this gorgeous bright green
- Combine everything:
- Mix potatoes, broccoli, chicken, onion, and garlic in your biggest bowl
- Make the sauce:
- Whisk together sour cream, milk, melted butter, cheese, and all those spices until silky smooth
- Coat it all:
- Pour that creamy sauce over the mixture and fold gently until everything is hugged
- Transfer and top:
- Spread into your prepared dish and shower with the remaining cheese
- Bake until golden:
- Let it go for 25 to 30 minutes until bubbling and beautifully bronzed on top
- Patience pays:
- Give it 5 minutes to rest so the sauce sets up slightly
Pin It This became my go-to when friends had babies or were going through rough patches. Something about the combination of textures and that warm cheese sauce makes people feel cared for. One friend told me months later that this dinner got her through her first week back at work after maternity leave.
Make Ahead Magic
I have assembled this entire casserole the night before, covered it tightly, and baked it straight from the fridge the next evening. Just add about 10 extra minutes to the baking time since it starts cold.
Freezing Instructions
This freezes beautifully either before or after baking. Wrap it incredibly well and it will keep for up to three months. Thaw overnight in the refrigerator before reheating at 350°F until hot through.
Serving Suggestions
A crisp green salad with vinaigrette cuts right through all that richness beautifully.
- Crusty bread for soaking up any extra sauce
- A glass of chilled white wine like Sauvignon Blanc
- Fresh fruit for dessert to lighten things up
Pin It Hope this brings as much comfort to your table as it has to mine over the years.
Common Questions
- → Can I prepare this casserole ahead of time?
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Yes, assemble the entire casserole up to 24 hours in advance, cover tightly, and refrigerate. Add 5–10 minutes to the baking time if baking cold from the refrigerator.
- → What can I use instead of sour cream?
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Greek yogurt makes an excellent lighter substitute with similar tanginess. For a dairy-free option, try a cashew cream or coconut milk blended with lemon juice.
- → Can I freeze leftovers?
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This casserole freezes well for up to 3 months. Cut into portions, wrap individually in foil and plastic, then thaw overnight in the refrigerator before reheating at 350°F until warmed through.
- → Do I have to pre-cook the potatoes?
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Yes, par-boiling the potatoes ensures they cook evenly and become tender without drying out. Skipping this step may result in undercooked, crunchy potatoes in the finished dish.
- → Can I use rotisserie chicken?
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Absolutely. A store-bought rotisserie chicken works perfectly and saves time. Simply shred or cube the meat, discarding the skin if desired, and use about 2 cups.
