Potato Chicken Broccoli Casserole

My youngest daughter actually helped me develop this recipe during one of those busy weeknight scrambles where the fridge seemed empty but everyone needed feeding NOW. We had leftover roasted chicken from Sunday, some potatoes starting to sprout, and a bag of broccoli that needed using. The version we made that first time was laughably simple—just thrown together with whatever cheese we had—but my husband took one bite and asked why Id never made it before.

Last winter, my neighbor Sarah came over with her three boys after soccer practice got canceled due to snow. I threw this together with what I had on hand, and those boys went back for thirds—something Sarah said never happened with vegetables at her house. Now she makes it every Sunday for the week ahead.

Ingredients

• 2 cups cooked chicken breast: Rotisserie chicken works perfectly here if you want to skip the cooking step
• 4 medium russet potatoes: Peel and dice them into bite-sized pieces so they cook evenly
• 2 cups broccoli florets: Fresh broccoli gives better texture than frozen
• 1 small onion: Finely chopped so it melts into the creamy sauce
• 2 cloves garlic: Minced fresh brings more flavor than garlic powder
• 1 cup sour cream: Greek yogurt makes a lighter substitute if you prefer
• 1 cup shredded cheddar cheese: Save extra half cup for that golden topping
• ½ cup milk: Whole milk creates the richest sauce
• 2 tablespoons unsalted butter: Melted before mixing makes it easier to incorporate
• 1 teaspoon salt: Adjust based on whether your chicken was pre-seasoned
• ½ teaspoon black pepper: Freshly ground adds a nice kick
• ½ teaspoon paprika: Adds a subtle smoky depth and beautiful color
• ½ teaspoon dried thyme: Brings an earthy note that complements the broccoli

Instructions

Get your oven ready:

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

Cook the potatoes:

Boil salted water and cook diced potatoes 8 to 10 minutes until fork-tender then drain well

Prep the broccoli:

Steam florets for 3 to 4 minutes until bright green but still firm

Combine everything:

Mix potatoes broccoli chicken onion and garlic in a large bowl

Make the creamy sauce:

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

Coat the mixture:

Pour sauce over the chicken and vegetables then stir gently to coat everything

Assemble the casserole:

Transfer to your baking dish and sprinkle remaining cheese on top

Bake until golden:

Bake uncovered 25 to 30 minutes until bubbly and cheese is lightly browned

Let it rest:

Wait 5 minutes before serving so the sauce sets up a bit

Save

This recipe became our go-to for new neighbors, sick friends, and those nights when nobody wants to cook but everyone wants something that feels like a hug. My mother-in-law actually asked for the recipe after she tasted it at our Easter potluck—now she makes it for her bridge club every month.

Make It Ahead

You can assemble the entire casserole up to 24 hours before baking and keep it covered in the refrigerator. Add an extra 10 minutes to the baking time if its cold from the fridge. I often make two—one for tonight and one to freeze unbaked for emergencies.

Cheese Variations

While cheddar is classic, Ive used Gruyère for extra nuttiness, pepper jack for some heat, or a mix of mozzarella and Parmesan when the kids are feeling adventurous. Just stick to cheeses that melt well and avoid fresh cheeses that might separate.

Serving Ideas

A crisp green salad with vinaigrette cuts through the richness perfectly. Cornbread or crusty garlic bread complete the meal. Sometimes I serve it over steamed rice if I want to stretch it even further.

• Try adding crispy bacon bits on top for extra crunch
• A dollop of sour cream and fresh chives makes it fancy
• Hot sauce on the side lets everyone customize their heat level

Save

Theres something about this casserole that makes people linger at the table longer than usual. Maybe its the comfort of familiar flavors or just that it reminds everyone of simpler times.

Recipe FAQ

→ Can I make this casserole ahead of time?

Absolutely. Assemble everything in the baking dish, cover tightly, and refrigerate up to 24 hours before baking. Add 5-10 minutes to the baking time since it will be cold.

→ What can I use instead of sour cream?

Greek yogurt makes an excellent lighter substitute with similar tang. Plain yogurt works too, though the sauce becomes slightly thinner. Cream cheese creates an even richer result.

→ Can I use raw chicken instead of cooked?

Yes, but you will need to cook the chicken first. Either pan-sear cubed breast until cooked through, or use leftover rotisserie chicken for a time-saving shortcut.

→ How do I store leftovers?

Store cooled portions in airtight containers in the refrigerator for 3-4 days. Reheat individual servings in the microwave, or cover the whole dish with foil and warm at 350°F.

→ Can I freeze this casserole?

Freeze before baking for best results. Wrap the prepared dish well and freeze up to 3 months. Thaw overnight in the refrigerator, then bake as directed adding extra time if needed.

→ What other vegetables work well?

Cauliflower florets substitute beautifully for broccoli. Try adding diced bell peppers, sliced mushrooms, or frozen peas for extra color and nutrition.