Baked Potato Chicken Broccoli Casserole

The first time I made this casserole, it was one of those frantic Tuesday nights when everyone was hungry and I had zero energy to be creative. I just started throwing things in a dish and prayed for the best. When my daughter took her first bite and actually asked for seconds, I knew this accidental dinner was worth keeping in the regular rotation.

Last winter when my friend Sarah was recovering from surgery, I brought over a pan of this casserole. She texted me two days later saying her teenage son who hates broccoli had eaten three helpings and asked when I was making it again. Sometimes the simplest meals end up meaning the most.

Ingredients

• 2 cups cooked chicken breast: I usually roast a couple extra breasts on Sunday or grab a rotisserie chicken, the texture works beautifully here.
• 4 medium russet potatoes: Diced small they cook faster and absorb more of that creamy sauce, dont skip the peeling or the texture gets weird.
• 2 cups broccoli florets: Fresh is best here, frozen tends to release too much water and make the casserole soupy.
• 1 small onion: Finely chopped so it melts into the background rather than being chunky.
• 2 cloves garlic: Minced fresh, nothing compares to that aromatic kick when it hits the hot sauce.
• 1 cup sour cream: This creates the velvety base, Greek yogurt works but the tang comes through more intensely.
• 1 cup plus ½ cup shredded cheddar cheese: The first cup melts into the sauce, the half cup on top creates that golden crust everyone fights over.
• ½ cup milk: Whole milk gives the best richness, but whatever you have in the fridge will do the job.
• 2 tablespoons unsalted butter: Melted into the sauce adds that finishing touch of comfort.
• 1 teaspoon salt, ½ teaspoon black pepper, ½ teaspoon paprika, ½ teaspoon dried thyme: This combination works harder than you expect, the thyme especially pulls everything together.

Instructions

Get your oven ready:

Preheat to 400°F and give your 9x13 baking dish a quick grease, I use butter because why not.

Cook the potatoes:

Boil those diced potatoes for 8 to 10 minutes until they just yield to a fork, you want them tender not falling apart.

Prep the broccoli:

Steam those florets for just 3 to 4 minutes, they should be bright green and still have some bite.

Combine everything:

In your largest bowl, toss together the cooked potatoes, steamed broccoli, chicken, onion, and garlic.

Make the sauce:

Whisk together the sour cream, milk, melted butter, one cup of cheese, and all those seasonings until smooth and creamy.

Coat and transfer:

Pour the sauce over your big bowl of ingredients, fold it together gently, then spread everything in your prepared dish.

Add the topping:

Sprinkle that remaining half cup of cheese across the top, covering as evenly as you can manage.

Bake to golden:

Let it bake uncovered for 25 to 30 minutes, you want it bubbling at the edges and gloriously browned on top.

The waiting game:

Let the casserole rest for 5 minutes, this small pause makes serving so much easier and keeps the sauce where it belongs.

Save to Pinterest

My neighbor started making this every Sunday after she smelled it baking through our shared kitchen wall. Now we swap variations back and forth, she adds bacon and I sometimes throw in diced bell peppers. Food has this way of building community without us even trying.

Making It Your Own

The beauty of casserooles is how forgiving they are. I have swapped in sweet potatoes when russets were nowhere to be found, and that subtle sweetness worked surprisingly well with the sharp cheddar. Monterey Jack brings a milder creaminess if cheddar feels too intense for your crowd.

Time Saving Tricks

On especially chaotic days, I have skipped the potato boiling entirely and used frozen hash browns instead. The texture changes slightly but nobody at my table has ever complained. You can also assemble everything the night before and bake when you walk in the door, though you might need an extra 5 to 10 minutes if baking cold from the refrigerator.

Serving Suggestions

A crisp green salad with vinaigrette cuts through all that rich creaminess perfectly. I also like serving roasted carrots on the side when I want to feel slightly virtuous about the vegetable situation.

• Crusty bread is never a bad idea for soaking up any sauce left on the plate.
• A light white wine like Pinot Grigio balances the heaviness beautifully.
• Leftovers make the most indulgent breakfast with a fried egg on top.

Save to Pinterest

Some meals feed you, but casseroles like this one somehow feed everyone around your table too. There is something special about watching people go back for seconds of something you threw together with love.

Your Recipe Questions

→ Can I prepare this casserole ahead of time?

Yes, assemble the entire casserole up to 24 hours in advance and refrigerate. Add 10-15 minutes to the baking time if cooking from cold.

→ What can I use instead of sour cream?

Greek yogurt makes an excellent lighter substitute. Plain Greek yogurt provides similar tang and creaminess while reducing fat content.

→ Can I freeze leftovers?

This dish freezes beautifully. Portion leftovers into airtight containers and freeze for up to 3 months. Thaw overnight in the refrigerator before reheating.

→ Do I need to cook the potatoes first?

Yes, par-boiling the diced potatoes for 8-10 minutes ensures they cook through evenly in the oven without becoming mushy or undercooked.

→ What cheeses work best in this casserole?

Sharp cheddar provides excellent flavor, but Monterey Jack, Colby Jack, or a blend of cheeses also work wonderfully for melting and taste.