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Ultimate Cheesy Chicken Potato Broccoli Casserole - Easy One Dish Family Dinner

This cheesy chicken potato broccoli casserole is the ultimate comfort food that brings the whole family together with tender chicken, creamy potatoes, fresh broccoli, and a triple-cheese topping. Everything cooks together in one baking dish, making cleanup a breeze while delivering maximum flavor for busy weeknights.
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Prep Time 20 minutes
Cook Time 1 hour
Total Time 1 hour 20 minutes
Servings: 6 servings
Calories: 480
Ingredients Method Notes

Ingredients
  

Ingredients
  • 2 lbs boneless, skinless chicken breasts, cubed
  • 4 medium potatoes, peeled and diced
  • 3 cups fresh broccoli florets
  • 1 large onion, chopped
  • 3 cloves garlic, minced
  • 2 cups shredded cheddar cheese
  • 1 cup shredded mozzarella cheese
  • 1/2 cup grated Parmesan cheese
  • 1 cup heavy cream
  • 1/2 cup chicken broth
  • 2 tbsp butter
  • 2 tbsp all-purpose flour
  • 1 tsp paprika
  • 1/2 tsp black pepper
  • 1 tsp salt
  • 1 tsp dried thyme

Method
 

Instructions
  1. Preheat your oven to 375°F (190°C). Grease a 9x13 inch baking dish with butter or cooking spray.
  2. In a large skillet, melt butter over medium heat. Add chopped onion and minced garlic, sautéing until fragrant and translucent, about 3-4 minutes.
  3. Add cubed chicken to the skillet and cook until lightly browned on all sides, about 5-6 minutes. Season with salt, pepper, paprika, and thyme.
  4. Sprinkle flour over the chicken mixture and stir well to combine. Cook for 1 minute to remove the raw flour taste.
  5. Gradually pour in chicken broth and heavy cream, stirring constantly until the sauce thickens slightly, about 2-3 minutes.
  6. In the prepared baking dish, layer the diced potatoes evenly across the bottom. Top with broccoli florets, then pour the chicken and sauce mixture over the vegetables.
  7. Cover the dish with aluminum foil and bake for 35 minutes. Remove from oven, uncover, and sprinkle all three cheeses evenly over the top.
  8. Return to oven uncovered and bake for another 15-20 minutes, or until cheese is golden and bubbly, and potatoes are tender when pierced with a fork.
  9. Let the casserole rest for 5-10 minutes before serving to allow the sauce to thicken slightly.

Notes

For even cooking, cut potatoes into uniform 1/2-inch cubes. Use fresh broccoli for vibrant color and crisp-tender texture. The combination of cheddar, mozzarella, and Parmesan creates perfect melt and flavor balance. Can be assembled ahead and refrigerated overnight before baking.