Baked Potato Chicken Broccoli Casserole

The first time I made this casserole, it was one of those Tuesday nights when the fridge was full of random ingredients and zero motivation. I had leftover roasted chicken from Sunday, potatoes sprouting eyes in the corner, and broccoli that needed attention immediately. My husband walked in mid-chop, asked what was happening, and thirty minutes later we were both standing over the baking dish, watching the cheese bubble through the oven door. Now it is the most requested dinner when temperatures drop below fifty degrees.

Last winter my sister came over for dinner after a particularly brutal week at work. She took one bite of this casserole, put her fork down, and actually got quiet for a full minute. That is when I knew this was not just food but something that could fix a rotten day from the inside out. We sat at the table for hours picking at the remaining bits in the dish and talking about nothing important.

Ingredients

• 2 cups cooked chicken breast: Rotisserie chicken works beautifully here or use leftover roasted chicken from earlier in the week
• 4 medium russet potatoes: Peel and dice them into uniform pieces so they cook evenly and become tender at the same time
• 2 cups broccoli florets: Fresh broccoli holds up better than frozen in this creamy casserole
• 1 small onion: Finely chopped so it melts into the sauce rather than having chunks of onion throughout
• 2 cloves garlic: Minced fresh garlic adds a nice aromatic base to the creamy sauce
• 1 cup sour cream: This creates the rich creamy base that holds everything together beautifully
• 1 cup shredded cheddar cheese: Plus an extra half cup for the topping because that golden cheese crust is essential
• ½ cup milk: Whole milk works best but any milk you have will do the job
• 2 tablespoons unsalted butter: Melt this into the sauce for extra richness and flavor
• 1 teaspoon salt: Adjust based on whether your cooked chicken was already seasoned
• ½ teaspoon black pepper: Freshly cracked adds the best flavor
• ½ teaspoon paprika: Adds a subtle warmth and beautiful color to the dish
• ½ teaspoon dried thyme: Earthy and pairs perfectly with the chicken and potatoes

Instructions

Get your oven ready:

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

Prep the potatoes:

Boil the diced potatoes for 8 to 10 minutes until just fork-tender then drain well

Steam the broccoli:

Cook the florets for 3 to 4 minutes until bright green and slightly tender

Combine the base:

Mix the 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 smooth

Bring it together:

Pour the sauce over the potato mixture and stir gently until everything is evenly coated

Assemble the casserole:

Transfer to your prepared baking dish and sprinkle with the remaining half cup of cheese

Bake until golden:

Cook uncovered for 25 to 30 minutes until bubbly with a beautifully golden cheese crust

Let it rest:

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

Bookmark

This recipe became a staple the year my daughter started kindergarten and suddenly we needed dinner that was both comforting and quick. She calls it the yellow cheese dinner and requests it every time she has had a hard day at school. Something about that creamy sauce and familiar combination just makes everything feel okay again.

Making It Your Own

I have learned that Greek yogurt works surprisingly well as a substitute for sour cream if you want something lighter. The tang is actually quite nice against the mild potatoes and chicken. A friend of mine adds cooked bacon bits and says it transforms the whole dish into something entirely different.

Side Dish Magic

A crisp green salad with vinaigrette cuts through the richness of the casserole perfectly. Sometimes I serve roasted carrots on the side too just to get more color on the plate. The contrast of hot cheesy casserole and cool fresh salad is honestly perfection.

Make Ahead Wisdom

You can assemble this casserole up to 24 hours ahead and keep it covered in the refrigerator. Add an extra 10 to 15 minutes to the baking time if it goes into the oven cold from the fridge. Leftovers reheat beautifully and I honestly think the flavors are even better the next day.

• Use a glass baking dish if you plan to make it ahead so you can see if it is fully heated through
• Let the dish come to room temperature for 20 minutes before baking if you have time
• Cover with foil for the first 20 minutes of baking if the top starts browning too quickly

Bookmark

There is something so satisfying about a casserole that brings everyone to the table and keeps them there.

Recipe FAQs

→ Can I make this casserole ahead of time?

Yes, assemble the entire casserole up to 24 hours in advance and refrigerate unbaked. Add 5-10 minutes to the baking time if baking cold from the refrigerator.

→ What other vegetables work well in this dish?

Cauliflower, carrots, or green beans make excellent additions or substitutions. Just ensure vegetables are cut into similar-sized pieces for even cooking.

→ Can I use raw chicken instead of cooked?

Cook raw cubed chicken breast in a skillet until no longer pink before adding to the mixture. Using pre-cooked chicken ensures the dish bakes evenly without undercooked meat.

→ How should I store leftovers?

Store in an airtight container in the refrigerator for 3-4 days. Reheat individual portions in the microwave or cover the entire dish with foil and warm at 350°F until heated through.

→ Can I freeze this casserole?

Freeze unbaked or baked portions in freezer-safe containers for up to 3 months. Thaw overnight in the refrigerator before baking or reheating.

→ What can I substitute for sour cream?

Greek yogurt, plain yogurt, or cream cheese all work well as substitutes. Greek yogurt provides the closest texture and tangy flavor while reducing fat content.