Baked Potato Chicken Broccoli Casserole

The first time I made this casserole, my apartment smelled so incredible that my neighbor actually knocked on my door to ask what was baking. I had been experimenting with using up leftover roasted chicken and some potatoes that were starting to sprout, not expecting much more than a simple dinner. But when I pulled that bubbling, golden dish from the oven, something magical happened. It became the recipe my friends started requesting for everything from potlucks to comforting weeknight meals.

Last winter, my sister came over after a particularly brutal week at work, and I made this without saying much. She took one bite of that cheesy, potatoey goodness and actually teared up a little. Sometimes food is just what someone needs to feel like everything will be okay again.

Ingredients

• 2 cups cooked chicken breast: Rotisserie chicken works perfectly here, or use leftovers from a roasted chicken dinner
• 4 medium russet potatoes: Dice them evenly so they all finish cooking at the same time
• 2 cups broccoli florets: Fresh broccoli gives better texture than frozen, but either will work in a pinch
• 1 small onion: Finely chopped so it melts into the creamy sauce rather than staying in distinct pieces
• 2 cloves garlic: Minced fresh garlic adds so much more flavor than garlic powder ever could
• 1 cup sour cream: Full fat makes the sauce richer and more satisfying
• 1 cup shredded cheddar cheese: Reserve extra half cup for that golden bubbly top everyone fights over
• ½ cup milk: Whole milk creates the best consistency, but whatever you have in the fridge will work
• 2 tablespoons unsalted butter: Melted before whisking into the sauce for easy incorporation
• 1 teaspoon salt: Adjust based on whether your cooked chicken was already seasoned
• ½ teaspoon black pepper: Freshly ground makes a noticeable difference
• ½ teaspoon paprika: Adds a subtle warmth and beautiful color to the sauce
• ½ teaspoon dried thyme: Earthy and slightly floral, thyme pairs perfectly with both chicken and potatoes

Instructions

Get your oven ready:

Preheat to 400°F and grease a 9x13 baking dish with butter or cooking spray

Prep the potatoes:

Boil diced potatoes in salted water for 8 to 10 minutes until they give slightly when pierced with a fork, then drain well

Steam the broccoli:

Cook florets for 3 to 4 minutes until they turn bright green but still have some crunch

Combine the filling:

Mix cooked potatoes, broccoli, chicken, onion, and garlic in a large bowl

Make the creamy sauce:

Whisk together sour cream, milk, melted butter, 1 cup cheese, and all seasonings until completely smooth

Bring it all together:

Pour the sauce over the chicken and vegetables and stir gently until everything is evenly coated

Assemble the casserole:

Transfer the mixture to your prepared baking dish and sprinkle with the remaining cheese

Bake until golden:

Bake uncovered for 25 to 30 minutes until the cheese is bubbling and starting to brown in spots

Let it rest:

Wait 5 minutes before serving so the sauce has time to set slightly

Save

My daughter now requests this for her birthday dinner every year, which feels funny since it is such a humble dish. But I have learned that comfort food does not need to be fancy to be special.

Make Ahead Magic

You can assemble the entire casserole up to 24 hours ahead and store it covered in the refrigerator. When you are ready to bake, add about 10 minutes to the cooking time since it will be cold.

Freezing Instructions

This casserole freezes beautifully either before or after baking. Wrap tightly in foil and freeze for up to 3 months. Thaw overnight in the refrigerator before baking as directed.

Serving Suggestions

A crisp green salad with tangy vinaigrette cuts through the richness perfectly. crusty bread for soaking up that creamy sauce is never a bad idea either.

• Try adding crispy bacon on top for the last 5 minutes of baking
• A dash of hot sauce wakes up the flavors without overwhelming the dish
• Fresh parsley or chives add a pop of color and fresh flavor

Save

There is something deeply satisfying about a casserole that feeds people well and makes the house smell wonderful. Hope this becomes a comfort in your kitchen too.

Recipe FAQs

→ Can I use frozen broccoli instead of fresh?

Yes, frozen broccoli works well in this dish. Thaw and drain it before adding to the mixture to prevent excess moisture in the casserole.

→ Can I assemble this ahead of time?

Absolutely! You can 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 other cheeses work in this dish?

Monterey Jack, Colby Jack, or Gruyère all pair beautifully with the chicken and vegetables. You can also use a mix of cheeses for added flavor complexity.

→ Can I make this dairy-free?

Yes, substitute dairy-free sour cream and cheese alternatives, and use olive oil or dairy-free butter in place of regular butter. The texture will remain creamy and satisfying.

→ How should I store leftovers?

Store cooled leftovers in an airtight container in the refrigerator for up to 4 days. Reheat individual portions in the microwave or cover the entire dish with foil and warm in a 350°F oven.

→ Can I add other vegetables?

Cauliflower, carrots, or bell peppers would be excellent additions. Just keep the total vegetable quantity similar to maintain proper cooking times and sauce coverage.