Keto Creamy Chicken and Broccoli Casserole

My partner came home one Tuesday evening saying he'd had enough of the same old keto meals, and honestly, I'd been thinking the same thing. That night, I pulled together chicken, broccoli, and every creamy ingredient in the fridge, threw it in a casserole dish, and let the oven do the magic. The result was so comforting and effortless that it's become our go-to weeknight dinner, the kind where everyone actually asks for seconds without me having to convince them it's keto-friendly.

I made this for my sister's dinner party last month, and watching everyone scoop seconds onto their plates was quieter than usual because they were too busy eating to talk. She asked if it was restaurant-quality, and I almost laughed at how simple it actually was to pull together.

Ingredients

• Chicken breast or thighs: Use pre-cooked rotisserie chicken if you're short on time, and dark meat stays more tender in casseroles.
• Broccoli florets: Steaming them first prevents excess moisture from watering down your sauce.
• Onion and garlic: Sautéing these together softens their bite and builds the flavor base.
• Heavy cream: This is what makes the sauce silky, and full-fat is non-negotiable here.
• Cheddar and mozzarella cheese: The combination gives you sharp flavor and stretch together, with cheddar adding that savory depth.
• Cream cheese: This acts as a binder and thickener while keeping everything creamy when it bakes.
• Olive oil, paprika, thyme, salt and pepper: These simple seasonings let the creamy sauce and cheese do the talking without overwhelming the dish.

Instructions

Heat your oven and prep:

Get the oven to 190°C (375°F) so it's ready when your casserole is mixed.

Build the flavor base:

Heat olive oil in a skillet and sauté the onion until it softens and turns translucent, then add garlic and cook just until it becomes fragrant. This takes about 4 minutes total and fills your kitchen with the smell of something good about to happen.

Combine everything:

In a large bowl, mix the cooked chicken, steamed broccoli, sautéed onion and garlic, heavy cream, cream cheese, half the cheddar, half the mozzarella, and all the seasonings. Stir until the sauce looks smooth and coats everything evenly.

Into the dish:

Pour the mixture into a lightly greased 20x20 cm casserole dish and spread it level.

Top and bake:

Sprinkle the remaining cheddar and mozzarella over the top and bake for 25 to 30 minutes until the edges bubble and the top turns golden. You'll know it's done when you see those brown spots on the cheese.

Rest before serving:

Let it sit for 5 minutes after coming out of the oven so the casserole sets slightly and becomes easier to portion.

Save

There's something about a casserole that transforms a regular dinner into an occasion, even when it's just the two of us at the table on a Wednesday. Somehow, serving it bubbling hot from the oven makes ordinary feel like celebration.

Cheese Selection Matters

The mix of cheddar and mozzarella isn't random; cheddar brings the flavor while mozzarella creates that stretchy, melted texture everyone loves. I've tried using just one or the other, and the dish feels one-dimensional, like it's missing its personality. Using them together is the secret to a casserole that tastes buttery and substantial without being heavy.

Making It Your Own

This casserole is forgiving enough to adapt based on what's in your kitchen or what you're craving. Cauliflower works beautifully swapped in for broccoli if you want something milder, and I've even used a mix of both when I'm trying to stretch ingredients. Some nights I add a splash of Dijon mustard to the cream mixture, which gives it a subtle tang that makes the whole dish feel more sophisticated than its simplicity suggests.

Storage and Serving Ideas

Leftovers keep beautifully in the fridge for up to 3 days, and reheating is as easy as covering it loosely and warming it in a 160°C oven for about 10 minutes. The flavors actually deepen the next day as everything mingles together, which is rare for casseroles.

• Serve alongside a simple green salad to cut through the richness with fresh crunch.
• Grate some Parmesan over the top before serving if you want extra savory depth.
• Leftovers make an unexpectedly good lunch when you reheat just one portion in a small skillet on the stovetop.

Save

This casserole has quietly become the dinner I reach for when I want comfort without the carbs, and it proves that keto eating doesn't mean sacrificing what makes food feel like home. Make it once and I promise it'll find its way onto your regular rotation.

Recipe FAQs

→ Can I use rotisserie chicken instead of cooking fresh chicken?

Yes, rotisserie chicken works perfectly and saves time. Simply shred or dice about 2 cups of meat and proceed with the recipe as written. The pre-seasoned rotisserie chicken adds an extra layer of flavor to the casserole.

→ How can I make this dish dairy-free?

Substitute the heavy cream with full-fat coconut cream or unsweetened almond milk thickened with a bit of almond flour. Replace the cheeses with a dairy-free cheese blend or nutritional yeast for flavor. The texture will be slightly different but still satisfying.

→ Can I prepare this casserole ahead of time?

Absolutely. Assemble the entire casserole, cover tightly with foil or plastic wrap, and refrigerate for up to 24 hours before baking. You may need to add 5-10 minutes to the baking time if baking from cold. Alternatively, bake completely and reheat individual portions.

→ What vegetables can I substitute for broccoli?

Cauliflower works beautifully as a direct substitute, maintaining the low-carb profile. You could also use frozen mixed vegetables, spinach, or asparagus. For a green variation, try zucchini slices or bell peppers. Adjust cooking time slightly depending on the vegetable chosen.

→ How do I store and reheat leftovers?

Store cooled leftovers in an airtight container in the refrigerator for up to 3 days. Reheat individual portions in the microwave at 50% power for 2-3 minutes, or cover the entire casserole with foil and warm in a 160°C oven for 15-20 minutes until heated through.

→ Is this casserole suitable for freezing?

Yes, this freezes well. After baking, let cool completely, wrap tightly in plastic wrap and foil, then freeze for up to 3 months. Thaw overnight in the refrigerator before reheating. The texture may be slightly softer after freezing but remains delicious.