This Rotisserie Chicken & Zucchini Casserole is a creamy, cheesy, and comforting one-pan meal loaded with tender shredded rotisserie chicken, fresh zucchini, a rich garlic cream sauce, and a golden cheesy topping. It’s an easy weeknight dinner that’s low in carbs, high in protein, and perfect for meal prep.

Recipe Overview

Ingredients

Casserole

• 3 cups shredded rotisserie chicken
• 3 medium zucchini, sliced into ¼-inch rounds
• 1 small yellow onion, diced
• 3 cloves garlic, minced
• 1 tablespoon olive oil
• 1 tablespoon unsalted butter
• 1 teaspoon Italian seasoning
• ½ teaspoon dried thyme
• ½ teaspoon smoked paprika
• 1 teaspoon salt
• ½ teaspoon black pepper

Creamy Sauce

• 4 ounces (115g) cream cheese, softened
• ½ cup sour cream
• ½ cup heavy cream
• 1 teaspoon Dijon mustard
• ½ cup grated Parmesan cheese

Cheese Topping

• 1½ cups shredded mozzarella cheese
• 1 cup shredded sharp cheddar cheese
• ¼ cup grated Parmesan cheese

Optional Add-Ins

• 1 cup sliced mushrooms
• 1 cup fresh spinach
• ½ cup cooked bacon, crumbled
• ½ teaspoon crushed red pepper flakes

Garnish

• Fresh parsley, chopped
• Chopped chives
• Extra Parmesan cheese

Equipment Needed

• 9×13-inch baking dish
• Large skillet
• Mixing bowls
• Wooden spoon
• Cheese grater
• Measuring cups and spoons

Instructions

Step 1: Preheat the Oven

Preheat the oven to 375°F (190°C).

Lightly grease a 9×13-inch baking dish with cooking spray or butter.

Step 2: Cook the Vegetables

Heat the olive oil and butter in a large skillet over medium heat.

Add the diced onion and cook for 3–4 minutes until softened.

Stir in the garlic and cook for 30 seconds.

Add the zucchini, Italian seasoning, thyme, smoked paprika, salt, and black pepper.

Cook for 5–6 minutes, stirring occasionally, until the zucchini begins to soften.

If using mushrooms or spinach, add them during the last 2 minutes of cooking.

Drain off any excess liquid from the zucchini to prevent a watery casserole.

Step 3: Make the Cream Sauce

In a large bowl, whisk together:

• Cream cheese
• Sour cream
• Heavy cream
• Dijon mustard
• Parmesan cheese

Mix until smooth and creamy.

Step 4: Assemble the Casserole

Add the shredded rotisserie chicken to the cream sauce and stir until coated.

Fold in the cooked zucchini mixture.

Transfer everything to the prepared baking dish and spread evenly.

Step 5: Add the Cheese

Sprinkle evenly over the top:

• Mozzarella cheese
• Cheddar cheese
• Parmesan cheese

If using bacon, sprinkle it over the cheese.

Step 6: Bake

Bake uncovered for 25–30 minutes, or until:

• The casserole is bubbling.
• The cheese is melted.
• The top is lightly golden.

For a crispier top, broil for 2–3 minutes at the end.

Step 7: Rest and Serve

Allow the casserole to rest for 5–10 minutes before serving.

Garnish with:

• Fresh parsley
• Chives
• Extra Parmesan cheese

Serve warm.

Tips for the Best Casserole

Remove Excess Moisture

Zucchini releases a lot of water while cooking. Sauté and drain it well before assembling the casserole.

Use Rotisserie Chicken

It adds flavor and saves time, making this recipe quick and convenient.

Shred Your Own Cheese

Freshly shredded cheese melts better and creates a creamier topping than pre-shredded cheese.

Let It Rest

Allowing the casserole to rest after baking helps it set and makes serving easier.

Flavor Variations

Buffalo Chicken

Add:

• ¼ cup buffalo sauce
• Blue cheese crumbles

Mexican Style

Replace the Italian seasoning with taco seasoning and use Pepper Jack cheese.

Mediterranean

Add:

• Sun-dried tomatoes
• Kalamata olives
• Crumbled feta cheese

Broccoli Chicken

Replace half the zucchini with steamed broccoli florets.

Keto Bacon Ranch

Mix in:

• 2 tablespoons ranch seasoning
• Extra bacon
• Cheddar cheese

What to Serve With

Side Dishes

• Garlic bread
• Dinner rolls
• Roasted asparagus
• Green beans
• Caesar salad
• Garden salad

Low-Carb Options

• Cauliflower rice
• Steamed broccoli
• Roasted Brussels sprouts

Storage Instructions

Refrigerator

Store leftovers in an airtight container for up to 4 days.

Freezer

Freeze the fully cooled casserole for up to 2 months.

Thaw overnight in the refrigerator before reheating.

Reheating

Oven

Bake at 350°F (175°C) for 15–20 minutes until heated through.

Microwave

Heat individual portions for 2–3 minutes.

Nutrition Information (Per Serving)

Frequently Asked Questions

Can I use cooked chicken breast instead of rotisserie chicken?

Yes. Any cooked, shredded, or diced chicken works well in this recipe.

Why is my casserole watery?

Zucchini naturally releases moisture during cooking. Sauté it first and drain any excess liquid before combining it with the sauce.

Can I prepare it ahead of time?

Absolutely. Assemble the casserole up to 24 hours ahead, cover, refrigerate, and bake just before serving.

Can I freeze it before baking?

Yes. Assemble the casserole, wrap it tightly, and freeze for up to 2 months. Thaw overnight in the refrigerator before baking.

Can I make it lighter?

Yes. Substitute light cream cheese, plain Greek yogurt for the sour cream, and reduced-fat cheese.

Recipe Notes

✅ High in protein

✅ Low-carb friendly

✅ Family-friendly

✅ Great for meal prep

✅ Freezer-friendly

Make-Ahead Tip

Assemble the casserole the night before, cover, and refrigerate. Let it sit at room temperature for 20–30 minutes before baking for even cooking.

Serving Suggestion

Serve with a crisp green salad, roasted vegetables, or garlic bread for a complete meal. A squeeze of fresh lemon juice or a sprinkle of chopped basil just before serving adds a fresh finishing touch.

Chef’s Secret

After sautéing the zucchini, spread it on paper towels for a few minutes to remove even more moisture—this keeps the casserole rich and creamy instead of watery. For a beautifully golden crust, combine the mozzarella with Parmesan and broil the casserole for the final 2–3 minutes. Finish with fresh parsley and cracked black pepper for a restaurant-quality presentation.