Keto Zucchini Chicken Casserole – Creamy, Comforting, and Low-Carb
This Keto Zucchini Chicken Casserole is the kind of weeknight dinner that makes everyone happy. It’s creamy, cheesy, and packed with flavor, but still light and low in carbs. You get tender chicken, layers of zucchini, and a rich, herbed sauce that pulls it all together.
It’s easy to prep ahead, great for meal prep, and perfect for anyone keeping carbs in check without giving up comfort food.
Ingredients
Method
- Prep the oven and pan: Preheat the oven to 375°F (190°C). Grease a 9x13-inch baking dish with olive oil or butter.
- Slice and sweat the zucchini: Cut the zucchini into thin rounds (about 1/8–1/4 inch). Lay them out on paper towels, sprinkle lightly with salt, and let them sit 10–15 minutes. This draws out moisture.
- Pat dry: Blot the zucchini well with fresh paper towels. Removing excess water helps prevent a watery casserole.
- Sauté aromatics: Warm 1 tablespoon olive oil or butter in a skillet over medium heat. Add onion and cook 3–4 minutes until soft. Stir in garlic and cook 30 seconds until fragrant.
- Make the creamy sauce: Lower the heat. Add cream cheese to the skillet, breaking it up with a spatula. Stir in heavy cream and chicken broth, whisking until smooth. Add Italian seasoning, red pepper flakes (if using), 1/4 teaspoon salt, and a few grinds of pepper. Simmer 2–3 minutes to thicken slightly. Stir in parmesan.
- Toss the chicken: Add the shredded chicken to the sauce. Stir to coat evenly and warm through. Taste and adjust seasoning.
- Layer the casserole: Spread half the zucchini slices in the prepared baking dish. Spoon half the creamy chicken mixture over the zucchini. Sprinkle with half the mozzarella. Repeat with remaining zucchini, chicken, and mozzarella.
- Bake: Cover the dish loosely with foil and bake 15 minutes. Remove the foil and bake another 10–15 minutes, until bubbly and lightly golden on top.
- Rest and garnish: Let the casserole rest 8–10 minutes before serving. Top with chopped parsley or basil for color and freshness.
- Serve: Scoop generous portions and enjoy as-is, or pair with a crisp side salad.
What Makes This Recipe So Good
- Low-carb and satisfying: You’ll get a filling, cozy casserole without the heavy starches. Zucchini steps in for noodles or rice and holds up beautifully.
- Protein-packed: Chicken and cheese bring serious protein, helping keep you full longer.
- Creamy without being heavy: A simple mix of cream cheese, broth, and parmesan creates a silky sauce that clings to every bite.
- Family-friendly flavor: Mild, savory, and cheesy enough to please picky eaters, with options to dial up spices if you like heat.
- Flexible prep: Use rotisserie chicken or leftover grilled chicken to save time, and customize the veggies and cheeses to your taste.
Shopping List
- Zucchini: 3 medium, sliced into thin rounds
- Cooked chicken: 3 cups, shredded or chopped (rotisserie works great)
- Cream cheese: 6 ounces, softened
- Heavy cream: 1/2 cup
- Chicken broth: 1/2 cup (low-sodium preferred)
- Shredded mozzarella: 1 1/2 cups
- Grated parmesan: 1/2 cup
- Olive oil or butter: 1–2 tablespoons
- Garlic: 3 cloves, minced
- Onion: 1/2 small, finely chopped (optional but tasty)
- Italian seasoning: 1 teaspoon
- Crushed red pepper flakes: 1/4 teaspoon (optional)
- Fresh parsley or basil: 2 tablespoons, chopped (for garnish)
- Salt and black pepper: To taste
Step-by-Step Instructions
- Prep the oven and pan: Preheat the oven to 375°F (190°C). Grease a 9×13-inch baking dish with olive oil or butter.
- Slice and sweat the zucchini: Cut the zucchini into thin rounds (about 1/8–1/4 inch).
Lay them out on paper towels, sprinkle lightly with salt, and let them sit 10–15 minutes. This draws out moisture.
- Pat dry: Blot the zucchini well with fresh paper towels. Removing excess water helps prevent a watery casserole.
- Sauté aromatics: Warm 1 tablespoon olive oil or butter in a skillet over medium heat.
Add onion and cook 3–4 minutes until soft. Stir in garlic and cook 30 seconds until fragrant.
- Make the creamy sauce: Lower the heat. Add cream cheese to the skillet, breaking it up with a spatula.
Stir in heavy cream and chicken broth, whisking until smooth. Add Italian seasoning, red pepper flakes (if using), 1/4 teaspoon salt, and a few grinds of pepper. Simmer 2–3 minutes to thicken slightly.
Stir in parmesan.
- Toss the chicken: Add the shredded chicken to the sauce. Stir to coat evenly and warm through. Taste and adjust seasoning.
- Layer the casserole: Spread half the zucchini slices in the prepared baking dish.
Spoon half the creamy chicken mixture over the zucchini. Sprinkle with half the mozzarella. Repeat with remaining zucchini, chicken, and mozzarella.
- Bake: Cover the dish loosely with foil and bake 15 minutes.
Remove the foil and bake another 10–15 minutes, until bubbly and lightly golden on top.
- Rest and garnish: Let the casserole rest 8–10 minutes before serving. Top with chopped parsley or basil for color and freshness.
- Serve: Scoop generous portions and enjoy as-is, or pair with a crisp side salad.
Keeping It Fresh
- Storage: Cool completely, then cover and refrigerate for up to 4 days. The flavors deepen by day two.
- Reheating: Reheat covered at 325°F until hot, about 15–20 minutes for a full dish, or 2–3 minutes in the microwave for single portions.
Add a splash of broth or cream if it looks dry.
- Freezing: Assemble unbaked, wrap tightly, and freeze up to 2 months. Thaw in the fridge overnight, then bake as directed, adding 5–10 minutes if needed.
Benefits of This Recipe
- Keto-friendly: Low in carbs, high in fat and protein to support ketosis without missing comfort food.
- Great for meal prep: Easy to make ahead, and leftovers hold up well for lunches and quick dinners.
- Veggie-forward: A delicious way to work in extra zucchini, especially when it’s abundant and affordable.
- Customizable: Change up cheeses, herbs, or add-ins to match your pantry and preferences.
- Balanced texture: Tender zucchini, juicy chicken, and melty cheese create a satisfying bite.
Common Mistakes to Avoid
- Skipping the zucchini prep: Not salting and blotting the zucchini often leads to a watery casserole. Take the extra 10 minutes.
- Overbaking: Too long in the oven dries out the chicken and splits the sauce.
Bake until just bubbly and set.
- Cutting zucchini too thick: Thick slices release more water and stay firm. Aim for thin, even rounds.
- Underseasoning: Zucchini is mild. Season the sauce well and taste as you go.
- Using pre-shredded cheese only: It works, but it can be less melty.
If possible, shred at least part of your cheese from a block.
Recipe Variations
- Buffalo-Style: Stir 2–3 tablespoons buffalo wing sauce into the cream sauce and top with a crumble of blue cheese before baking.
- Bacon Ranch: Add 1 teaspoon ranch seasoning to the sauce and fold in 1/3 cup crumbled cooked bacon. Finish with sliced green onions.
- Pesto Twist: Swap Italian seasoning for 2 tablespoons basil pesto and use shredded provolone in place of mozzarella.
- Mushroom and Spinach: Sauté 1 cup sliced mushrooms and 2 cups baby spinach with the onions to boost veggies and umami.
- Spicy Jalapeño: Add 1–2 seeded, sliced jalapeños and a pinch of cayenne. Pepper jack cheese makes it extra bold.
- Dairy-Light Option: Use less mozzarella and swap half the cream for unsweetened almond milk.
The sauce will be thinner but still tasty.
FAQ
Can I use raw chicken instead of cooked?
Yes, but cook it first. Quickly pan-sear bite-size pieces in a little oil until just cooked through, then proceed with the recipe. Using rotisserie or leftover chicken simply saves time.
How do I keep the casserole from getting watery?
Salt and blot the zucchini, slice it thin, and avoid overbaking.
You can also briefly grill or roast the zucchini slices for a few minutes first to remove extra moisture if you prefer.
What cheese works best?
Mozzarella melts nicely and keeps flavors mellow. For more punch, mix in sharp cheddar, provolone, fontina, or a bit of gouda. Keep parmesan in the sauce for savory depth.
Is this recipe gluten-free?
Yes.
There’s no flour or breadcrumbs, and all ingredients listed are naturally gluten-free. Just verify your broth and seasonings to be sure.
Can I make it ahead?
Absolutely. Assemble the casserole up to the point of baking, cover, and refrigerate for up to 24 hours.
Bake when ready, adding a few extra minutes if it’s cold from the fridge.
What can I serve with it?
A simple green salad with olive oil and lemon, roasted asparagus, or sautéed green beans keeps the meal light and keto-friendly. Cauliflower rice also makes a great side if you want more volume.
How many servings does this make?
A 9×13-inch dish typically yields 6 generous servings. For meal prep, portion into individual containers once cooled.
Final Thoughts
This Keto Zucchini Chicken Casserole brings cozy, weeknight comfort without the carb overload.
It’s simple to assemble, flexible with ingredients, and easy to love. Keep the zucchini well-prepped, season the sauce boldly, and you’ll end up with a creamy, cheesy bake that fits your goals and tastes like a treat. Make it once, and it’ll slide right into your regular dinner rotation.
Printable Recipe Card
Want just the essential recipe details without scrolling through the article? Get our printable recipe card with just the ingredients and instructions.
