Chicken Broccoli Alfredo Casserole

If you’re searching for a comforting, crowd-pleasing dish that combines tender chicken, fresh broccoli, and rich Alfredo sauce, look no further than this Chicken Broccoli Alfredo Casserole. It’s creamy, cheesy, and packed with flavor, making it perfect for weeknight dinners or casual gatherings. This casserole offers an easy way to enjoy a restaurant-quality meal right at home without spending hours in the kitchen.

Why This Recipe Is Reliable

This Chicken Broccoli Alfredo Casserole recipe stands out because it balances convenience with exceptional taste. Using a trusted Alfredo sauce brand and straightforward seasoning allows the natural flavors of the chicken and broccoli to shine. Plus, the careful layering of cheeses ensures gooey, melty goodness in every bite. It’s a recipe that’s been tested multiple times to guarantee consistent results, so you can confidently serve it to your family and friends.

What You’ll Need

• 1 small onion, diced small
• 2 tsp. olive oil
• 1 tablespoon minced garlic
• One 15 oz. jar Rao’s Alfredo Sauce (see notes)
• 1/2 teaspoon poultry seasoning
• 1/2 teaspoon ground thyme
• 1 teaspoon Spike Seasoning
• 1/4 teaspoon black pepper (or more, to taste)
• 1/2 cup sour cream
• 6 cups cooked, diced chicken breast (see notes)
• 6 cups broccoli florets (or a little more)
• 1 1/2 cups grated Swiss cheese
• 1/2 cup grated Parmesan cheese

Kitchen Gear Checklist

• Large skillet – for sautéing onions and garlic
• Mixing bowl – to combine sauce and seasonings
• 9×13-inch casserole dish – for baking the casserole
• Measuring spoons and cups – to ensure accurate ingredient amounts
• Grater – for shredding Swiss and Parmesan cheeses
• Knife and cutting board – for dicing onion and chicken
• Steamer basket or microwave-safe bowl – to cook broccoli florets

Chicken Broccoli Alfredo Casserole: From Prep to Plate

Step 1: Prep Your Ingredients

Start by dicing the small onion finely and mincing the garlic. Chop your cooked chicken breasts into bite-sized pieces. If you haven’t cooked the chicken yet, poach or bake it until fully cooked and juicy. Wash and trim the broccoli into florets, then steam them lightly until tender-crisp.

Step 2: Sauté Onion and Garlic

Heat 2 teaspoons of olive oil in a large skillet over medium heat. Add the diced onion and sauté until translucent, about 3-4 minutes. Stir in the minced garlic and cook for another minute until fragrant. This step builds a flavorful base for your sauce.

Step 3: Mix the Alfredo Sauce and Seasonings

In a large mixing bowl, combine the jar of Alfredo sauce with poultry seasoning, ground thyme, Spike seasoning, black pepper, and sour cream. Stir well to blend all the flavors harmoniously. Then fold in the sautéed onions and garlic for an extra layer of richness.

Step 4: Assemble the Casserole

Preheat your oven to 350°F (175°C). In the casserole dish, evenly layer the cooked chicken and steamed broccoli. Pour the Alfredo mixture over the top, making sure to coat everything thoroughly. Sprinkle the grated Swiss cheese and Parmesan cheese evenly across the surface.

Step 5: Bake Until Bubbling and Golden

Place the casserole in the preheated oven and bake for 25-30 minutes, or until the cheese is melted, bubbly, and lightly golden on top. Let it cool for a few minutes before serving to allow the casserole to set.

Step 6: Serve and Enjoy

Scoop generous portions onto plates and enjoy the creamy, cheesy comfort of this Chicken Broccoli Alfredo Casserole. Pair it with a crisp green salad or garlic bread for a complete meal.

Swap Guide

• Chicken: Substitute with turkey breast or firm tofu for a different protein option.
• Broccoli: Use cauliflower florets or green beans if you want a change of veggies.
• Alfredo Sauce: Homemade Alfredo sauce can be used instead of the jarred version for a fresher taste.
• Cheese: Mozzarella or Gruyère can replace Swiss cheese for a different melt and flavor.
• Sour Cream: Greek yogurt is a tangier alternative that adds creaminess.

Don’t Do This

• Don’t skip steaming the broccoli. Raw broccoli will be too firm after baking and won’t mesh well with the creamy sauce.
• Don’t use pre-cooked chicken that’s heavily seasoned or smoked, as it can overpower the delicate Alfredo flavors.
• Don’t overbake the casserole. It can dry out the chicken and cause the sauce to separate.
• Don’t forget to mix the seasonings thoroughly into the sauce — uneven seasoning leads to bland spots.

Freezer-Friendly Notes

This Chicken Broccoli Alfredo Casserole freezes beautifully. For best results, assemble the casserole but skip baking it. Cover tightly with foil and freeze for up to 3 months. When ready to eat, bake from frozen at 350°F (175°C) for about 50-60 minutes, or until heated through and bubbly. You can also freeze leftovers in individual portions for quick reheat meals.

Troubleshooting Q&A

My casserole turned out watery. What did I do wrong?

Watery casseroles usually happen if the broccoli was not steamed enough or if the sauce was too thin. Make sure to steam the broccoli until just tender, and if your Alfredo sauce seems overly runny, you can thicken it slightly by simmering it for a few minutes before mixing with the other ingredients.

Can I use frozen broccoli instead of fresh?

Yes, frozen broccoli works well in this recipe. Just thaw and drain any excess water before mixing it into the casserole to avoid excess moisture.

How can I make this dish spicier?

To add some heat, consider sprinkling crushed red pepper flakes into the sauce or topping the casserole with sliced jalapeños before baking. You can also swap Spike Seasoning for a spicy seasoning blend.

Is it okay to use pre-shredded cheese?

Pre-shredded cheese often contains anti-caking agents that can affect melting. For the best creamy texture, shred your own Swiss and Parmesan cheeses.

Weekend Projects

• Baked Chicken Alfredo Penne Casserole – Try this pasta-based twist on your next weekend cooking adventure.
• Homemade Alfredo Sauce from Scratch – Master your own creamy sauce for even richer casseroles.
• Roasted Garlic and Herb Chicken Breast – Prepare chicken with extra flavor to add to future casseroles.
• Cheesy Vegetable Casserole – Experiment with different veggies and cheeses for a versatile side dish.

The Takeaway

This Chicken Broccoli Alfredo Casserole is a delicious, reliable recipe that hits all the right notes with creamy sauce, tender chicken, and fresh broccoli. Its ease of preparation and flexibility with ingredients make it an ideal go-to meal for busy families or anyone craving a hearty, cheesy dinner. Whether you’re making it for a weeknight or serving it for guests, this casserole promises satisfaction in every bite. For more casserole inspiration, be sure to check out the Cheesy Chicken Alfredo Casserole and Baked Chicken Alfredo Penne Casserole recipes.

Give this recipe a try and enjoy the comforting flavors of creamy Alfredo, tender chicken, and fresh broccoli in one easy, cheesy dish!

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