Name: Alfredo Chicken and Broccoli Bake (Low Carb, Gluten Free)
Prep time: 15 min
Cook time: 35 min
Total time: 55 min
Yield: 4
Cuisine: American
Ingredients: 4 pieces thick-cut bacon; 1 yellow onion, diced; 1 large carrot, diced; 1-½ cups chopped broccoli florets (chop into small pieces, about 1-inch in size); 5 cloves garlic, minced (about 1 tablespoon); 4 ounces cream cheese, softened; ½ cup chicken broth; 1 teaspoon garlic powder; 3/4 teaspoon fine sea salt; 1-½ cups roasted spaghetti squash (see notes for instructions); 2 cups pre-cooked chicken (e.g. rotisserie, or any cooked leftover chicken!); ⅓ cup Parmesan cheese; ½ cup + 2-4 tablespoons grated cheddar cheese

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This Alfredo Chicken and Broccoli Bake is a creamy, cheesy, and satisfying dish - the ultimate comfort food packed with veggies, protein and flavor! Chicken, fresh broccoli florets, carrots, cream cheese, cheddar, and Parmesan cheese are just a few of the highlights. Roasted spaghetti squash is also a star ingredient for a low-carb alternative to traditional pasta bakes!

A baked alfredo chicken and broccoli casserole with a wooden spoon.

why this recipe works

If you're a fan of creamy, cheesy comfort food but want a healthier twist, this chicken broccoli Alfredo bake is the perfect solution. It delivers all the rich, indulgent flavors of classic Alfredo pasta in a veggie-packed skillet meal that is light, healthy, and low glycemic.

Instead of traditional pasta, this recipe uses spaghetti squash for a low-carb alternative. The combination of tender chicken, fresh broccoli, and a homemade alfredo sauce made with cream cheese, Parmesan, and garlic creates a creamy, flavorful dish the whole family will happily devour!

Not only is this an easy recipe to prepare, but it’s also a great way to use up leftover chicken or rotisserie chicken from the grocery store.

You'll cook up the veggies, mix everything together in a casserole dish, pop it in the oven so the cheese can melt, and you have a complete meal in just 25-30 minutes.

This dish is also packed with protein and healthy fats, making it a filling, nutrient-dense option for busy weeknights. Plus, it reheats beautifully, so you can enjoy leftovers the next day without sacrificing flavor.

Whether you’re following a low-carb lifestyle or just want a satisfying, home-cooked meal, this chicken broccoli Alfredo casserole is a must-try!

It is:

an easy casserole with simple ingredients that is perfect for busy weeknights
the ultimate comfort food: a creamy, cheesy pasta bake without the extra carbs.
kid-friendly with all of that flavorful, cheesy goodness
low carb, low-glycemic, and gluten free
a great recipe for meal prep since you can store leftovers in an airtight container and reheat the next day for an easy lunch.

the ingredients

Here's a look at what you will need:

Ingredients for alfredo chicken and broccoli bake in small bowls.

Chicken. Using pre-cooked chicken is a time-saver and a wonderful way to use any leftover shredded or chopped chicken (like rotisserie chicken!)
Bacon. Cooked up strips of bacon are chopped into bits, then stirred into the casserole to add unbeatable flavor.
Spaghetti squash. A low-carb substitute for traditional pasta. You will need to pre-cook it ahead of time, but it's an easy step!
Fresh broccoli, carrot, and onion. Adds color and flavor, plus a boost of nutrients to this chicken bake.
Cream cheese and vegetable stock. These are necessary to create that creamy sauce that mimics true Alfredo! We're using cream cheese instead of heavy cream since it's thicker, richer, and won't create a soggy casserole.
Parmesan cheese and cheddar cheese. The cheeses are mixed into the casserole and melt on top to create the perfect cheesy layer.
Garlic. Fresh, minced garlic and a dash of garlic powder make this chicken broccoli casserole taste like a classic chicken alfredo casserole.

low-carb chicken broccoli bake

Making chicken broccoli alfredo casserole is simple and doable any night of the week!

With tender chicken, fresh broccoli, and a creamy Alfredo sauce, this dish is ready in just 25-30 minutes. It’s a family favorite that’s easy to prepare and packed with cheesy, comforting flavor.

Here's a quick look at how to make this Alfredo chicken and broccoli bake, but be sure to view the printable recipe card at the bottom of the page for all of the details.

First, add the bacon to a large skillet over medium heat and cook until golden brown and crisp. Remove and set on a paper towel lined plate. When the bacon is cool enough to handle, chop it up and set it aside.

Cooking veggies in a black cast iron skillet.

Spoon out all but 2 tablespoons of the bacon grease from the skillet. Add the onion and carrot and cook for 3-4 minutes over medium-high heat to soften slightly. Add in the chopped broccoli and cook for another 3 minutes.

Alfredo chicken and broccoli bake with spaghetti squash in a skillet before baking.

Stir in the minced garlic, cream cheese, and chicken broth. Stir to help the mixture melt.

Add in the cooked spaghetti squash, chicken, chopped bacon, and ½ cup of the grated cheese. Mix well, then sprinkle another 2 tablespoons of cheese on top of the casserole.

Transfer to the oven and bake at 400°F for 15 minutes. Remove and let cool for 5 minutes before serving.

recipe notes

Roasting spaghetti squash: To roast spaghetti squash, slice it in half lengthwise and set it on a baking sheet. Drizzle about 1 teaspoon of olive oil on each side. Season with salt and pepper, and then place each half cut side down. Roast for 25-35 minutes at 400°F or until tender. Remove and let cool for 5 minutes, then use a fork to pull out shreds of spaghetti squash. You will need 1-½ cups for this recipe, which is usually the equivalent of half of the roasted squash. Reserve the rest for another recipe.
Chicken: Rotisserie chicken or any type of pre-cooked chicken will work great in this recipe. If you don’t have any on hand, you can toss 3 boneless/skinless chicken thighs in the skillet after the bacon is done cooking. Cook for 5-6 minutes per side or until cooked through.

Baking dish: If you don't have an oven-safe skillet, simply transfer everything into a prepared baking dish after you've cooked it on the stovetop. Add the cheese, pop it into the oven, and bake for 15 minutes.

Scooping out a serving of Alfredo chicken and broccoli bake.

substitutions and additions

I love that this is a veggie-loaded casserole with low-carb spaghetti squash standing in for cooked pasta. For a more classic chicken broccoli Alfredo recipe, you can omit the spaghetti squash and toss the mixture with 6-8 ounces of prepared lupini pasta like Kaizen, a high-protein and low-carb option. Or, use your own favorite pasta substitute to keep this dish low carb, keto-friendly, and low glycemic!
Feel free to substitute the chicken with chopped turkey breast or even shrimp for a delicious spin!
Add your own spin to the tasty sauce. Stir in some Italian seasoning or fresh herbs, or kick up the heat with a tablespoon of Cajun seasoning!

what to serve with chicken alfredo broccoli bake

This rich and creamy Alfredo chicken and broccoli bake pairs perfectly with lighter sides. A crisp green salad with creamy balsamic basil vinaigrette adds freshness and balance to the meal.

My high-protein bread or a side of roasted vegetables can round out the dish without overpowering its flavors.

Try serving it with cauliflower rice or sautéed spinach or kale for a low-carb option. Whether you go for something light or buttery, or packed with extra veggies, there are plenty of delicious ways to complete this comforting meal.

storage tips

Refrigerate. Store leftovers in an airtight container in the fridge for 3-4 days.
Reheat. Warm in a safe bowl in the microwave or covered with aluminum foil in the oven at 350°F.
Freeze. Wrap in plastic wrap and freeze for up to 3 months for an easy chicken bake later!