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Creamy High-Protein Chicken Casserole

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Total Time: 1 hour 5 minutes (15 minutes prep, 50 minutes cook) | Difficulty: Easy | Serves: 6-8

This is the ultimate comfort food, re-engineered to fuel your body without sacrificing flavor. Our Creamy High-Protein Chicken Casserole ditches the canned soups and heaviness, building a rich, tangy sauce from scratch with Greek yogurt and cottage cheese for a massive protein boost. Packed with lean chicken, hearty veggies, and whole-grain pasta, it’s a satisfying, balanced meal that delivers on coziness and nutrition.

Ingredients

For the Casserole Base:

  • 1 pound boneless, skinless chicken breasts, cut into 1-inch cubes

  • 8 ounces (about 2 ½ cups) whole-grain rotini, penne, or cavatappi pasta

  • 1 tablespoon olive oil

  • 1 medium yellow onion, diced

  • 3 cloves garlic, minced

  • 8 ounces cremini mushrooms, sliced

  • 2 cups fresh broccoli florets, cut into small pieces

  • 1 teaspoon kosher salt, divided

  • ½ teaspoon black pepper

  • ½ teaspoon smoked paprika

  • 1 teaspoon dried thyme

For the High-Protein Cream Sauce:

  • 1 cup low-fat cottage cheese (small curd)

  • 1 cup plain Greek yogurt (2% or full-fat for best texture)

  • ½ cup low-sodium chicken broth

  • ⅓ cup grated Parmesan cheese

  • 1 tablespoon Dijon mustard

  • 1 tablespoon fresh lemon juice

For the Cheesy Topping:

  • 1 ½ cups shredded part-skim mozzarella cheese, divided

  • ¼ cup grated Parmesan cheese

  • Optional for crunch: ¼ cup whole-wheat panko breadcrumbs tossed with 1 teaspoon olive oil

Equipment

  • 9×13 inch baking dish

  • Large pot for boiling pasta

  • Large skillet or Dutch oven

  • Food processor or high-speed blender (for ultra-smooth sauce)

  • Mixing bowls

  • Whisk

Instructions

Step 1: Prep & Par-Cook Components

  • Time: 15 minutes | Intensity: Medium-High (Multi-Task)

  • Preheat your oven to 375°F (190°C). Lightly grease your 9×13 baking dish.

  • Cook the Pasta: Bring a large pot of salted water to a boil. Add the whole-grain pasta and cook for 2-3 minutes LESS than the package directs for al dente. It will finish cooking in the oven. Drain and set aside.

  • Sauté Aromatics & Chicken: While the pasta cooks, heat olive oil in a large skillet over medium-high heat. Add the diced onion and mushrooms. Cook for 5-6 minutes, until the onions are soft and the mushrooms have released their moisture and browned.

  • Add the cubed chicken, ½ teaspoon salt, black pepper, smoked paprika, and dried thyme. Cook for 5-7 minutes, stirring occasionally, until the chicken is cooked through and no longer pink in the center. In the last minute, add the minced garlic and stir until fragrant. Remove from heat.

Step 2: Create the Secret Protein Sauce

  • Time: 5 minutes | Intensity: Low (Blender)

  • In a food processor or high-speed blender, combine the cottage cheese, Greek yogurt, chicken broth, ⅓ cup Parmesan, Dijon mustard, and lemon juice.

  • Blend for 45-60 seconds until the mixture is completely smooth and creamy. This step eliminates any curds from the cottage cheese, creating a luxuriously smooth, high-protein base. Taste and add remaining ½ teaspoon salt if desired.

Step 3: Assemble the Casserole

  • Time: 5 minutes | Intensity: Low

  • In the large skillet with the chicken and mushrooms (off the heat), add the drained par-cooked pasta, raw broccoli florets, and the blended cream sauce.

  • Gently fold everything together until the pasta, chicken, and broccoli are evenly coated. The broccoli will cook perfectly in the oven.

  • Stir in 1 cup of the shredded mozzarella cheese until just combined.

  • Transfer the entire mixture to the prepared baking dish, spreading it into an even layer.

Step 4: Top & Bake

  • Time: 25 minutes covered, 10-15 minutes uncovered | Intensity: Medium (Passive/Oven)

  • Sprinkle the remaining ½ cup of mozzarella and ¼ cup of Parmesan cheese evenly over the top. For a crunchy topping, scatter the optional oiled panko breadcrumbs over the cheese.

  • Cover the dish tightly with aluminum foil and bake on the center rack for 25 minutes. This allows the casserole to heat through and the broccoli to steam-tenderize.

  • Remove the foil and bake for an additional 10-15 minutes, or until the topping is golden brown and the casserole is bubbly around the edges.

Step 5: The Essential Rest

  • Time: 10 minutes | Intensity: Low (Critical Passive)

  • Remove the casserole from the oven. Let it rest, uncovered, for at least 10 minutes before serving. This allows the sauce to thicken further, the flavors to settle, and makes serving clean portions possible.

Serving Suggestions & Variations

  • Complete the Plate: Serve with a bright, simple side salad dressed with a lemon vinaigrette to cut through the richness.

  • Grain-Free: Substitute the whole-grain pasta with 4 cups of cooked cauliflower rice or a hearty legume pasta.

  • Different Veg: Swap broccoli for asparagus spears (cut into 1-inch pieces) or a bag of fresh spinach (wilts dramatically—add it raw before baking).

  • Herb Lift: Stir 2 tablespoons of chopped fresh dill or tarragon into the sauce before blending for a fresh, aromatic twist.

  • Turkey Version: Use lean ground turkey or shredded rotisserie chicken for a quicker alternative.

Expert Tips for Success

  • Smooth Sauce is Key: Do not skip blending the cottage cheese. This creates the illusion of a rich, cream-based sauce without the heaviness. If you don’t have a blender, use an immersion blender in a deep bowl.

  • Don’t Overcook the Pasta: The pasta will absorb liquid from the sauce in the oven. Undercooking it ensures it won’t become mushy.

  • Uniform Cubes: Cutting the chicken into even, 1-inch pieces guarantees quick, uniform cooking without drying out.

  • Fresh Lemon Juice: The acid from fresh lemon juice is crucial—it brightens the entire dish and balances the creamy elements.

  • Resting is Non-Negotiable: Serving immediately will result in a runny casserole. The rest period lets the proteins in the yogurt and cheese set.

Make-Ahead & Storage Instructions

This casserole is a meal-prep champion, tasting even better the next day.

  • Full Make-Ahead: Assemble the casserole completely (through Step 3) up to 24 hours in advance. Cover and refrigerate. Add the topping just before baking. You may need to add 5-10 minutes to the covered baking time since it starts cold.

  • Refrigerating Leftovers: Cool completely and store in an airtight container in the refrigerator for up to 4 days.

  • Freezing: This casserole freezes very well. Assemble and bake as directed. Cool completely, then wrap the entire dish (or portion into individual containers) tightly in plastic wrap and foil. Freeze for up to 3 months.

  • Reheating:

    • From Fridge: Reheat individual portions in the microwave for 1.5-2 minutes, or cover the whole dish with foil and reheat in a 350°F oven for 20-25 minutes until hot throughout.

    • From Frozen: Thaw overnight in the refrigerator before reheating as above. To reheat from frozen, cover with foil and bake at 350°F for 45-60 minutes, removing the foil for the last 10 minutes.

Nutrition Information

*Per serving (based on 8 servings). Values are estimates calculated with full-fat Greek yogurt and including optional panko.*

  • Calories: ~345 kcal

  • Total Fat: 12g

  • Saturated Fat: 5g

  • Cholesterol: 65mg

  • Sodium: ~620mg

  • Total Carbohydrates: 28g

  • Dietary Fiber: 4g

  • Sugars: 5g

  • Protein: 32g

*Nutrition Note: This dish is an excellent source of complete protein, primarily from the chicken, Greek yogurt, and cottage cheese. It provides a significant portion of daily calcium and vitamin B12. The whole-grain pasta and broccoli add valuable fiber. For lower sodium, use no-salt-added broth and reduce added salt.*

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