Healthier Broccoli Chicken Casserole Recipe | Gimme Some Oven

I still remember the smell of my mom’s Healthier Broccoli Chicken Casserole baking in the oven—cheesy, creamy, and always topped with crispy breadcrumbs. It was a weeknight staple and the ultimate comfort food. But like many dishes from the past, it was loaded with canned soup and heavy ingredients. This modern version keeps all the cozy nostalgia while skipping the processed shortcuts, making it a fantastic option for beginner cooks looking to create a quick and healthy meal.

This easy sheet pan dinner-style casserole is perfect if you’re short on time but still want something hearty and homemade. It’s balanced with lean protein, nutrient-packed broccoli, and a creamy mushroom cheddar sauce made entirely from scratch—no cans involved. The best part? It’s flexible and forgiving, which makes it ideal for first-timers in the kitchen.

Why This Recipe is Special

This casserole is a fresh twist on a retro favorite. Unlike traditional versions that rely on cream of mushroom soup, this one uses a homemade mushroom sauce with real ingredients, giving it rich flavor without processed additives. The combination of sautéed mushrooms, garlic, and sharp cheddar cheese creates a satisfying depth that even picky eaters will enjoy.

The use of rotisserie chicken or pre-cooked chicken is a huge time saver, and you can swap in your favorite pasta or even use a gluten-free option. It’s hearty, family-friendly, and perfect for meal prep. With just one baking dish and a saucepan, cleanup is minimal too.

Ingredients and Preparation

Pasta
Acts as the base of the casserole and soaks up the creamy sauce. You can use traditional, whole-wheat, gluten-free, or even chickpea or lentil pasta for extra protein.

Broccoli
Adds a burst of color, texture, and essential nutrients like fiber, Vitamin C, and antioxidants. You can use fresh florets or frozen broccoli, which makes prep even easier.

Mushrooms
Offer a meaty texture and earthy flavor that deepens the richness of the sauce. Baby bella (cremini) mushrooms work best, but white button mushrooms are a good alternative.

Chicken
Provides lean protein and heartiness. Rotisserie chicken or leftover baked chicken makes this step simple. Turkey or plant-based chicken substitutes can also be used.

Onion and Garlic
Build the aromatic foundation of the sauce, adding savory depth and warmth.

Butter or Olive Oil
Used for sautéing, these fats help develop flavor in the base of the sauce. Olive oil is a heart-healthier choice.

Flour
Thickens the mushroom sauce into a creamy consistency. For a gluten-free option, use cornstarch or a GF flour blend.

Stock and Milk
Combine to create a creamy, pourable base. Use chicken or vegetable stock, and any milk of your choice (dairy or non-dairy).

Dijon Mustard
Adds a subtle tanginess that brightens up the flavor and balances the richness.

Sharp Cheddar Cheese
Brings that cheesy, comforting goodness to the dish. Use freshly grated cheese for best melt and flavor. Mozzarella or a cheese blend can be used instead.

Salt and Pepper
Simple seasonings that bring all the flavors together.

Step-by-Step Instructions

Boil the Pasta and Broccoli: In a large pot of salted boiling water, cook the pasta until al dente. About one minute before it’s finished, add the broccoli florets to the same pot to quickly soften them. Drain both and set aside.

Sauté the Vegetables: In a large pan, heat the butter or olive oil over medium heat. Add the thinly sliced onion and cook until softened, about 3 minutes. Stir in the mushrooms and garlic and continue to sauté until the mushrooms are browned and tender, about 5 more minutes.

Make the Sauce: Sprinkle the flour evenly over the mushroom mixture and stir it in to coat everything. Let it cook for a minute to remove the raw flour taste. Gradually add the stock while stirring to smooth out any lumps, then pour in the milk, Dijon mustard, salt, and pepper. Bring to a gentle simmer until the sauce thickens. Turn off the heat and stir in half of the shredded cheddar cheese until melted.

Assemble the Casserole: In a large 9×13-inch baking dish, combine the cooked pasta, broccoli, shredded chicken, and creamy mushroom sauce. Toss gently until everything is well mixed and evenly coated.

Bake the Casserole: Spread the mixture into an even layer and bake uncovered at 400°F for 15 minutes. Remove from the oven, sprinkle the remaining cheese over the top, and return to the oven for another 10 minutes until the cheese is melted and bubbling.

Serve Warm: Let the casserole rest for a few minutes before serving. Garnish with freshly cracked black pepper or chopped herbs like parsley if desired.

Beginner Tips and Notes

• If your sauce turns out too thick, add a splash of milk or broth to loosen it up.
• Don’t overcook the broccoli in the boiling water—it will continue to cook in the oven.
• Use rotisserie chicken to save prep time and add flavor.
• A nonstick sauté pan can help prevent sticking when making the mushroom sauce.
• For easier cleanup, mix everything in the baking dish instead of a separate bowl.

Serving Suggestions

This Healthier Broccoli Chicken Casserole style casserole goes wonderfully with a crisp green salad, garlic bread, or roasted vegetables. For added brightness, a squeeze of lemon over the top before serving works beautifully.

Leftovers can be stored in an airtight container in the fridge for up to 4 days. Reheat in the microwave or oven until warmed through. This dish also freezes well—just thaw overnight and reheat with a splash of milk for moisture.

Engagement Features

We’d love to hear how your casserole turned out. Did you try a different pasta or cheese? Maybe add some herbs or a spicy twist? Let us know in the comments! Cooking is a journey, and your feedback can inspire others to try their hand at this quick and healthy meal.

This recipe is all about simplicity, flexibility, and comfort—perfect for beginner home cooks who want delicious results without a lot of stress. Give it a go, and happy cooking!

FAQ About Healthier Broccoli Chicken Casserole

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