Creamy chicken and broccoli casserole (low carb, high protein & extra cheesy)

Let's be real for a second. When most people hear "low carb dinner," they picture sad lettuce wraps and a life of quiet suffering. But this creamy chicken and broccoli casserole? It's the recipe that changes that conversation entirely.

We're talking shredded chicken swimming in a rich, garlicky cream sauce, broccoli florets tucked in throughout, a blanket of melted cheddar on top, and crispy bacon crumbles that make the whole thing feel like a celebration. IMO, this is what healthy comfort food is actually supposed to look like.

I made this for the first time on a cold Sunday evening when I wanted something that felt indulgent but wouldn't derail the week. One bite in and I immediately understood why casseroles have been a thing forever.

There's something about a bubbling, cheesy bake coming out of the oven that just fixes whatever is wrong with your day. The whole family cleaned the dish, and my nephew — who claims to hate broccoli — went back for a second helping without saying a word. That's when you know you've got a winner.

The best part is how straightforward this is to pull together. You don't need any fancy techniques or hard-to-find ingredients. Just good simple food done well. Let's get into it.

Why you'll love this recipe

• It's genuinely low carb without tasting like it. The cream sauce is so rich and satisfying that you won't miss the pasta or rice one bit. It stands completely on its own.
• The protein content is serious. Between the shredded chicken and the cheese, each serving packs a solid protein punch that keeps you full for hours.
• Crispy bacon on top makes everything better. This is not up for debate. The bacon adds a salty, smoky crunch that contrasts beautifully with the creamy filling underneath.
• It's a one-dish meal. Everything goes into one baking dish. Less cooking, less cleanup, more time doing literally anything else.
• It reheats incredibly well. This casserole might actually taste better the next day once all the flavors have had time to settle together. Meal prep dream right here.
• It's naturally gluten free. No flour, no breadcrumbs, no pasta. Just real whole ingredients that happen to work perfectly together.

Ingredients with key notes

For the casserole filling:

• 3 cups cooked shredded chicken — rotisserie chicken is your best friend here. It saves time, adds flavor, and shreds perfectly. Leftover baked chicken works great too.
• 4 cups fresh broccoli florets — cut them into similar-sized pieces so they cook evenly. Fresh broccoli gives the best texture but frozen works too — just thaw and pat completely dry first or the casserole will turn watery.
• 6 strips bacon, cooked and crumbled — cook it until it's properly crispy. Limp bacon on top of a casserole is a crime. Reserve a tablespoon of the bacon fat for extra flavor if you want.
• 1.5 cups shredded sharp cheddar cheese — sharp cheddar gives more flavor than mild. Shred it yourself from a block — pre-shredded cheese has anti-caking agents that affect how it melts.
• 1/2 cup shredded mozzarella — mixed with the cheddar for extra stretch and meltiness.

For the cream sauce:

• 8 oz cream cheese, softened — this is the backbone of the sauce. Let it come to room temperature before mixing so it blends smoothly without lumps.
• 1 cup sour cream — adds tanginess and keeps the sauce from being too heavy. Full fat gives the best result.
• 1/2 cup chicken broth — thins the sauce to the right consistency and adds a savory depth.
• 3 cloves garlic, minced — fresh garlic makes a real difference here. Garlic powder works in a pinch but fresh is better.
• 1 tsp onion powder
• 1 tsp dried Italian seasoning
• 1/2 tsp smoked paprika — adds a subtle warmth and a little color to the sauce.
• Salt and black pepper to taste

Step-by-step instructions

Step 1 — Preheat and prep

Preheat your oven to 375F (190C). Lightly grease a 9x13 inch baking dish with butter or cooking spray and set it aside. If you haven't cooked your bacon yet, do that now in a skillet over medium heat until properly crispy. Set it aside on a paper towel to drain, then crumble once cooled.

Step 2 — Blanch the broccoli

Bring a pot of salted water to a boil and add the broccoli florets. Blanch for just 2 minutes — you want them bright green and slightly tender but nowhere near cooked through. Drain immediately and run cold water over them to stop the cooking. Pat them completely dry with a kitchen towel. This step is important — excess water is the enemy of a good casserole.

Step 3 — Make the cream sauce

In a large mixing bowl, beat the softened cream cheese until smooth. Add the sour cream, chicken broth, minced garlic, onion powder, Italian seasoning, smoked paprika, salt, and pepper. Mix everything together until you have a smooth, creamy sauce. Taste it and adjust the seasoning — it should be well seasoned since it's going to be carrying the whole dish.

Step 4 — Combine the filling

Add the shredded chicken and broccoli florets to the cream sauce and fold everything together until evenly coated. Pour the mixture into your prepared baking dish and spread it out into an even layer.

Step 5 — Add the cheese and bacon

Mix the shredded cheddar and mozzarella together in a small bowl. Sprinkle the cheese mixture evenly over the top of the casserole. Scatter the crumbled bacon over the cheese layer.

Step 6 — Bake

Transfer the baking dish to the preheated oven and bake uncovered for 25-30 minutes until the cheese is melted, golden, and bubbling at the edges. If you want the top a little more golden and caramelized, switch the oven to broil for the last 2-3 minutes and watch it carefully. Let the casserole rest for 5 minutes before serving — this helps it set up and makes it easier to portion.

Serving suggestions

This casserole is a complete meal on its own but here are a few ways to round it out:

• Serve alongside a simple green salad with a light lemon vinaigrette to cut through the richness of the casserole.
• Cauliflower rice on the side keeps things low carb and soaks up the cream sauce beautifully.
• If you're not strict about carbs, a slice of warm crusty bread on the side for scooping is honestly hard to beat.
• A dollop of sour cream on each serving adds an extra layer of creaminess that works really well.
• Garnish with freshly sliced green onions and a crack of black pepper right before serving for a little freshness and color.
• Roasted garlic green beans or steamed asparagus make a great low carb side that doesn't compete with the flavors in the casserole.

Storage tips

Refrigerator: Cover the baking dish tightly with foil or transfer leftovers to an airtight container. The casserole keeps well in the fridge for up to 4 days. The flavors actually develop and deepen overnight so day two is genuinely excellent.

Reheating: Reheat individual portions in the microwave covered for 2-3 minutes, stirring halfway through. To reheat the whole dish, cover with foil and warm in a 350F oven for 15-20 minutes until heated through. Remove the foil for the last 5 minutes to re-crisp the cheese on top.

Freezer: This casserole freezes really well. Let it cool completely, then wrap the baking dish tightly in plastic wrap and then foil, or transfer to freezer-safe containers. It keeps in the freezer for up to 3 months. Thaw overnight in the fridge before reheating.

Make ahead tip: You can assemble the entire casserole up to 24 hours in advance, cover it tightly, and refrigerate it unbaked. When you're ready to eat, pull it out of the fridge 20 minutes before baking and add 5-10 minutes to the bake time since it's going in cold.

Closing

This creamy chicken and broccoli casserole is the kind of recipe that quietly becomes a household staple. It shows up when the weather turns cold, when someone needs a comforting meal, when you want to feed a crowd without spending all day in the kitchen. And it does all of that while being low carb and genuinely high in protein — which is the kind of pleasant surprise that makes you feel like you've figured something out.

Make it once and it'll earn a permanent spot in your dinner rotation. And if someone at your table claims they don't like broccoli, just wait. They'll come around. They always do.

With gratitude, Kip.