Potato Chicken And Broccoli Casserole | Protein-rich balanced meal

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When people struggle with casseroles, it’s usually not the baking part—it’s the sauce. If the sauce is too thin, the dish turns soupy. Too thick, and the whole thing feels heavy and dry. In this Potato Chicken And Broccoli Casserole, the key technique is mastering a simple, reliable cheese sauce that bakes up creamy every time. Once you get that down, the rest is just layering ingredients you probably already have.

I like this recipe because it uses basic staples—potatoes, broccoli, leftover chicken—and turns them into a full pan that feeds a crowd without much stress. The sauce starts with a quick roux, which is just butter and flour cooked together. The important part is cooking it long enough to remove the raw flour taste, but not so long that it turns dark and pasty. From there, you whisk in broth and milk until it lightly coats the back of a spoon. That’s your visual cue that it’s ready for the cheese.

Once you understand this sauce, you can swap in different cheeses, add more veggies, or scale it up for meal prep. It also means you don’t need canned soup or specialty ingredients—just a pan, a whisk, and a few minutes of focus at the stove. If you’re looking for a weeknight standby that’s filling, uses up leftover chicken, and reheats well, this casserole earns a spot in your regular rotation.

The Magic of Potato Chicken And Broccoli Casserole

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Clean, Wholesome Ingredients

• 1 pound cooked chicken breast, chopped or shredded (leftover rotisserie or roasted works well)
• 4 cups peeled and chopped white potatoes, cut into small cubes
• 2 large heads of broccoli, florets only, chopped
• 4 tablespoons salted butter
• 1/2 cup minced white onion
• 4 tablespoons all-purpose flour
• 1 cup chicken broth or stock
• 1 cup whole milk (or other milk you have on hand)
• 2 cups shredded cheddar cheese, divided (white or orange)
• 1 teaspoon smooth Dijon mustard
• 1 teaspoon kosher salt
• 1/4 teaspoon ground black pepper
• 1 teaspoon garlic powder
• 1/2 teaspoon onion powder
• 1 tablespoon olive oil
• 3/4 cup plain panko breadcrumbs

Step-by-Step to a Comforting Classic

1. Preheat your oven to 350°F (175°C). Put a large pot of water on to boil and set out a large casserole dish (a standard lasagna pan or a 3.8-quart dish both work well).
2. When the water reaches a rolling boil, add the cubed potatoes. Cook for 5–6 minutes, until they’re just fork-tender. They should pierce easily but still hold their shape.
3. Use a slotted spoon to transfer the potatoes into the casserole dish. Add the cooked chicken on top. Leave the hot water in the pot for the broccoli.
4. Add the broccoli florets to the same boiling water. Cook for 1 minute, just until they turn a brighter green. Drain well, then add the broccoli to the casserole dish with the potatoes and chicken.
5. Place the empty pot back on the stove over medium-low heat. Add the butter and let it fully melt.
6. Stir in the minced onion and cook for about 5 minutes, until the onion is soft and fragrant but not browned.
7. Sprinkle the flour over the butter and onions. Stir constantly to form a thick paste (roux) and cook for 1 minute. This brief cook time removes the raw flour taste.
8. Slowly pour in the chicken broth and milk while whisking. Increase the heat to medium and keep whisking until the sauce thickens and lightly coats the back of a spoon without running off.
9. Add 1 cup of shredded cheddar cheese to the thickened sauce. Stir until the cheese is fully melted and the sauce is smooth.
10. Turn off the heat. Stir in the Dijon mustard, salt, black pepper, garlic powder, and onion powder. Taste and adjust seasoning if needed.
11. Pour the cheese sauce evenly over the chicken, potatoes, and broccoli. Gently stir in the dish so everything is well coated and distributed.
12. Cover the casserole dish tightly with foil and bake for 20 minutes. This helps the flavors meld and finishes cooking the potatoes.
13. While the casserole bakes, mix the olive oil and panko breadcrumbs in a small bowl until the crumbs are evenly coated. They should look lightly damp, not greasy.
14. After 20 minutes, remove the casserole from the oven and carefully take off the foil. Sprinkle the remaining 1 cup of cheddar cheese evenly over the top, then add the oiled panko in an even layer.
15. Return the uncovered casserole to the oven and bake for another 10 minutes, or until the top is golden, the edges are bubbling, and the center is hot.
16. Let the casserole rest for 5–10 minutes before serving so it can set slightly and slice more cleanly. Serve warm and enjoy.

Best Cheeses to Use

Cheddar is the most budget-friendly and reliable choice for this Potato Chicken And Broccoli Casserole, but you’ve got options if you want to tweak flavor or use what’s already in your fridge. For best melting, choose cheeses that are semi-hard and melt smoothly. A mix of half sharp cheddar and half mild cheddar gives both flavor and creaminess without becoming oily. You can swap in part mozzarella for extra stretch, or add a bit of Monterey Jack or Colby for a milder, kid-friendly result. Avoid using only pre-shredded cheese if possible, since the anti-caking powders can make the sauce grainy—grating from a block melts more smoothly and usually costs less per ounce.

Swaps for Leftover Chicken

This recipe is ideal for using up leftovers so nothing goes to waste. Any cooked chicken works: roasted, rotisserie, grilled, or even poached. If you don’t have chicken, you can use turkey, leftover roast pork, or cooked sausage in the same amount. For a budget-friendly vegetarian version, skip the meat and add a can of drained chickpeas or white beans plus an extra cup of broccoli or another vegetable. You can also stretch a smaller amount of meat by mixing in beans or lentils, turning odds and ends from the fridge into a full pan of comfort food without extra grocery runs.

Make-Ahead and Freezing Tips

For busy nights, it helps to break this recipe into small tasks. You can parboil the potatoes and broccoli, cook the sauce, and assemble the casserole up to a day in advance. Cover tightly and refrigerate; when you’re ready to bake, let it sit at room temperature for 15–20 minutes, then bake covered, adding 5–10 extra minutes if it’s very cold. Add the cheese and panko topping just before the final bake so it stays crisp. For freezing, assemble the casserole without the breadcrumb topping, cool completely, then wrap well. Freeze for up to 2 months. Thaw overnight in the fridge, bake covered until hot, then finish with fresh cheese and breadcrumbs for the last 10–15 minutes.

Adding Extra Veggies or Crunch

This casserole is a good base for clearing out the produce drawer. You can stir in frozen peas, corn, spinach, or diced carrots along with the broccoli—no need to cook peas or corn first, just add them frozen. Thinly sliced mushrooms or bell peppers can be sautéed with the onions for extra flavor. To boost fiber and stretch the dish, add an extra cup of broccoli or a handful of chopped kale. For more crunch on top, mix in crushed crackers, cornflakes, or even the end of a bag of plain chips with the panko. Just keep the total topping amount about the same so it browns evenly and doesn’t soak up too much moisture.

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Potato, Chicken, and Broccoli Casserole

Turn leftover chicken into a cozy, make-ahead casserole featuring tender potatoes, bright broccoli, and a silky homemade cheddar sauce topped with crispy panko. This hearty, from-scratch bake is comforting, family-friendly, and easy to prepare.

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Prep Time 15 minutes mins

Cook Time 1 hour hr

Total Time 1 hour hr 15 minutes mins

Servings 8 servings

Equipment

• large saucepan
• large casserole dish (9x13 or 3.8-qt)
• Slotted spoon
• Small bowl
• whisk

Ingredients

  

• 1 pound cooked chicken breast chopped or shredded
• 4 cups white potatoes peeled and chopped into cubes (uncooked)
• 2 large heads broccoli chopped, florets only
• 4 tablespoons salted butter
• 1/2 cup white onion minced
• 4 tablespoons all-purpose flour
• 1 cup chicken broth or stock
• 1 cup whole milk
• 2 cups shredded cheddar cheese divided; white or orange
• 1 teaspoon Dijon mustard smooth
• 1 teaspoon kosher salt
• 1/4 teaspoon ground black pepper
• 1 teaspoon garlic powder
• 1/2 teaspoon onion powder
• 1 tablespoon olive oil
• 3/4 cup panko breadcrumbs plain, unseasoned

Instructions

 

• Heat the oven to 350°F (175°C). Bring a large pot of water to a rolling boil and set out a roomy casserole dish (a 9x13 or a 3.8-qt round works well).
• Add the peeled, cubed potatoes to the boiling water and cook 5–6 minutes, or until a fork slides through easily.
• Lift the potatoes from the pot with a slotted spoon and transfer them directly into the prepared casserole dish with the chopped or shredded cooked chicken; keep the pot of water boiling.
• Drop the broccoli florets into the same boiling water and blanch for about 1 minute. Drain the broccoli and add it to the casserole dish with the potatoes and chicken.
• Return the empty saucepan to the stove and melt the butter over medium-low heat.
• Add the minced onion to the melted butter and sauté until softened and fragrant, approximately 5 minutes.
• Stir in the flour to form a roux with the butter and onion, cooking for about 1 minute to remove the raw flour taste.
• Slowly whisk in the chicken broth and milk, increase heat to medium, and continue whisking until the sauce thickens enough to coat the back of a spoon.
• Once the sauce has thickened, stir in 1 cup of the shredded cheddar until it melts completely and the sauce is smooth.
• Remove the sauce from the heat and blend in Dijon mustard, kosher salt, black pepper, garlic powder, and onion powder until evenly incorporated.
• Pour the cheese sauce over the chicken, potatoes, and broccoli in the casserole dish and gently stir to combine everything evenly.
• Cover the dish tightly with foil and bake in the preheated oven for 20 minutes.
• While the casserole bakes, mix the panko breadcrumbs with the olive oil in a small bowl to moisten and help them brown.
• Carefully remove the foil, sprinkle the remaining 1 cup shredded cheddar over the casserole, then top with the oiled panko crumbs.
• Return the casserole to the oven and bake uncovered for about 10 minutes, or until the filling is bubbling and the topping is golden.
• Allow the casserole to rest a few minutes before serving so it sets slightly, then portion and enjoy.

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