Potato Chicken Broccoli Casserole

The first time I made this casserole, it was supposed to be a quick dinner using up leftover roasted chicken from Sunday. My roommate walked through the door while I was mixing everything together and immediately asked what smelled so incredible. That night we ate straight from the baking dish, standing in the kitchen, too impatient to bother with proper plates.

Last winter my sister came over after a terrible day at work, and I pulled this casserole out of the oven just as she walked in. She took one bite of those tender potatoes in that cheesy sauce and actually started crying. Sometimes food is just comfort, and this recipe understands that assignment completely.

Ingredients

• 2 cups cooked chicken breast: Rotisserie chicken works beautifully here, or use leftover roasted chicken. Cubed holds its shape better than shredded in this casserole.
• 4 medium russet potatoes: Peel and dice them evenly so they cook at the same rate. Dont skip parboiling or theyll stay crunchy while everything else gets done.
• 2 cups broccoli florets: Fresh broccoli gives better texture than frozen. Steam just until bright green, about 3 minutes, so it doesnt turn to mush in the oven.
• 1 small onion and 2 cloves garlic: Finely chopped so they distribute evenly throughout every bite. The garlic mellows nicely as it bakes.
• 1 cup sour cream: Full fat gives the best creamy consistency. Greek yogurt works too but adds a slight tang that changes the flavor profile.
• 1 cup plus ½ cup shredded cheddar cheese: Sharp cheddar brings the most flavor. The first cup melts into the sauce, the rest creates that golden crust on top.
• ½ cup milk and 2 tablespoons butter: Whole milk makes the sauce richer. Melt the butter before whisking it in so it incorporates smoothly.
• 1 teaspoon salt, ½ teaspoon black pepper, ½ teaspoon paprika, and ½ teaspoon dried thyme: The paprika adds subtle warmth and pretty color. Thyme pairs perfectly with both chicken and potatoes.

Instructions

Preheat and prepare your baking dish:

Set your oven to 400°F and give a 9x13 inch baking dish a light coating of butter or cooking spray. This size accommodates all the ingredients without spilling over.

Parboil the potatoes:

Bring a large pot of salted water to boil, then add your diced potatoes. Cook 8 to 10 minutes until just fork tender, then drain immediately so they dont continue cooking.

Steam the broccoli:

Either use a steamer basket or place florets in a pot with an inch of boiling water. Steam for 3 to 4 minutes until bright green but still firm.

Combine the solid ingredients:

In a large mixing bowl, add cooked potatoes, steamed broccoli, chicken, onion, and garlic. Toss gently to distribute everything evenly.

Make the creamy sauce:

Whisk together sour cream, milk, melted butter, one cup of cheddar, and all seasonings until completely smooth. The mixture should be thick and spreadable.

Coat everything evenly:

Pour the sauce over your potato and chicken mixture. Stir gently but thoroughly, making sure every piece gets covered in that cheesy goodness.

Assemble the casserole:

Transfer everything to your prepared baking dish, spreading it into an even layer. Sprinkle the remaining half cup of cheddar across the top.

Bake until golden:

Bake uncovered for 25 to 30 minutes. Youre looking for bubbling around the edges and cheese thats starting to brown in spots.

Rest before serving:

Let the casserole sit for 5 minutes out of the oven. This short wait helps the sauce set slightly so each serving holds its shape better.

Save

This recipe became my go-to contribution for family potlucks after my uncle asked for the recipe three holidays in a row. Theres something about hot cheesy comfort food that brings everyone to the table, even the picky eaters who normally skip the vegetables.

Make It Ahead

You can assemble this casserole completely, cover it tightly, and refrigerate for up to 24 hours before baking. Add about 10 minutes to the baking time if cooking from cold. The flavors actually meld together even better when given time to sit.

Freezing Instructions

This freezes beautifully either before or after baking. Wrap tightly in foil and freeze for up to 3 months. Thaw overnight in the refrigerator before reheating at 350°F until heated through, about 20 minutes.

Serving Suggestions

A crisp green salad with vinaigrette cuts through the richness nicely. Garlic bread or dinner rolls complete the meal, especially for soaking up any extra sauce on your plate.

• Cooked bacon bits add a smoky crunch that plays well with the cheddar
• Monterey Jack cheese brings a milder flavor if sharp cheddar feels too bold
• A sprinkle of fresh parsley right before serving adds bright color against the golden cheese

Save

Some recipes are just reliable, and this one has never let me down. Hope it finds its way into your regular rotation too.

Recipe FAQs

→ Can I make this ahead of time?

Yes, assemble the casserole up to 24 hours ahead and refrigerate. Add 10-15 minutes to baking time if baking cold from the refrigerator.

→ Can I freeze this casserole?

Freeze unbaked for up to 3 months. Thaw overnight in refrigerator before baking. Already-baked portions freeze well for 2 months.

→ What can I substitute for sour cream?

Greek yogurt works perfectly for a lighter version. Plain Greek yogurt provides similar tang and creaminess with more protein.

→ Do I need to cook the chicken first?

Yes, use fully cooked chicken breast. Leftover rotisserie chicken works great, or cook fresh chicken breast specifically for this dish.

→ Can I use frozen broccoli?

Frozen broccoli works well. Thaw and drain excess moisture before adding to prevent a watery texture. Fresh broccoli offers better crunch.

→ How do I know when it's done?

The casserole is ready when bubbling around edges and cheese on top is golden brown. Potatoes should be easily pierced with a fork.