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This cheesy spinach casserole is an easy holiday side dish! Topped with buttery crackers and packed with rotisserie chicken, it’s creamy, delicious, and ready in 40 minutes.

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Looking for a simple yet delicious side dish for your holiday table? This cheesy spinach casserole is a great way to add flavor and comfort to your Easter, Thanksgiving, or Christmas dinner. It’s packed with creamy goodness, topped with a crunchy topping, and made even heartier with shredded rotisserie chicken.

This easy spinach recipe comes together quickly with simple ingredients like chopped spinach, mozzarella cheese, sour cream, and buttery crackers. Plus, it’s the perfect make-ahead side dish—prep it the night before and bake it when ready.

Why You’ll Love This Spinach Casserole

• Quick & Easy – Just 10 minutes of prep and into the oven it goes!
• Creamy & Cheesy – A rich, creamy sauce with melted cheese makes every bite irresistible.
• Perfect for Holidays – This cheesy spinach casserole is great for Easter, Thanksgiving, and Christmas dinners.
• Customizable – Easily make it vegetarian or swap in different cheeses for added flavor.

Ingredients You’ll Need

This spinach casserole is made with simple pantry and fridge staples:

For the Casserole:

• 2 (10-ounce) packages of Frozen Chopped Spinach – Cooked and drained of excess moisture
• 1 Rotisserie Chicken – Skinned, boned, and shredded (Approx. 4 cups or 1.5 pounds)
• ⅔ cup Condensed Cream of Mushroom Soup – Adds a rich, creamy base
• ¼ cup Milk (Room Temperature) – Helps create a smooth texture
• 1 cup shredded Mozzarella Cheese – For that melty, cheesy goodness
• ½ cup Sour Cream (Room Temperature) – Makes the casserole extra creamy
• 2 tablespoons Butter – For cooking the sauce
• ½ teaspoon Sea Salt & ¼ teaspoon Black Pepper – Enhances flavor

For the Crunchy Topping:

• 2 cups crushed Ritz Crackers – The perfect buttery, crunchy topping
• 3 tablespoons Melted Butter – Mix with the crackers for a golden brown crust

Step-by-Step Instructions

Preheat & Prep

Preheat your oven to 350°F. Grease an 8×8 prepared baking dish with olive oil or butter.

Cook the Spinach

Follow the package instructions to cook the chopped spinach. Press the spinach in a large bowl with paper towels to drain out any excess water. Removing excess moisture prevents a watery casserole.

Make the Creamy Sauce

Melt 2 tablespoons of butter in a medium saucepan over low heat. Stir in the cream of mushroom soup, milk, sour cream, and shredded cheese. Mix well until the cheese melts and a creamy sauce forms.

Combine & Assemble

Add the cooked spinach mixture and shredded rotisserie chicken into the saucepan. Stir everything together until well combined. Transfer the mixture to the prepared baking dish.

Make the Crunchy Topping

Mix the crushed Ritz crackers in a small bowl with three tablespoons of melted butter. Sprinkle evenly over the spinach mixture.

Bake & Serve

Bake uncovered for 30 minutes or until the top is golden brown. Let cool slightly before serving.

How to Make This Spinach Casserole Vegetarian

Leave the shredded rotisserie chicken if you prefer a vegetarian spinach casserole. Thanks to the cheese, sour cream, and cream of mushroom soup, this casserole is still packed with flavor and protein.

To add more texture and protein, mix cottage cheese, heavy cream, or panko breadcrumbs for extra crunch.

More Holiday Side Dish Favorites

•  47 Easter Casserole Ideas (Breakfast and Dinner Recipes)
• 41 Family Approved Sides To Serve with Ham
• 67 Delicious Christmas Eve Crockpot Dinner Ideas

Save Time with Costco Pre-Shredded Rotisserie Chicken

Costco’s pre-shredded rotisserie chicken is one of my favorite time-saving hacks for dinner prep. I buy a bulk pack, portion it into 1.5-pound freezer bags, and store it for easy meals throughout the week. It’s a great shortcut for recipes like this casserole, soups, and even breakfast casseroles.

If you’re using frozen shredded chicken, thaw it in the fridge overnight and chop it up before adding it to the spinach mixture.

Storage & Make-Ahead Tips

Storing Leftovers

• Any leftover spinach casserole should be placed in an airtight container and stored in the refrigerator for up to four days.
• Reheat in the microwave or oven until warmed through.

Make-Ahead Option

• Assemble the casserole without the topping and store it covered in the fridge for up to 24 hours.
• Add the crunchy topping right before baking.

What to Serve with Spinach Casserole

This cheesy spinach casserole pairs well with:

• Grilled or roasted meats – Turkey, ham, or beef tenderloin
• Fresh garden salad – A lighter contrast to the creamy casserole
• Garlic roasted potatoes – A hearty, comforting side
• Parmesan cheese-topped dinner rolls or Crusty Bread – To soak up the creamy sauce

Enjoy this casserole with steamed vegetables or a fresh side salad for a low-carb meal.

This easy spinach casserole is a holiday must-have! Whether you’re making it for Thanksgiving, Christmas, or Easter, its creamy sauce, crunchy topping, and rich flavors will keep everyone coming back for more. Plus, with the shredded rotisserie chicken, it’s protein-packed and satisfying.

You can make this dish ahead of time, store it quickly, and enjoy a stress-free holiday meal. Let me know if you try this spinach casserole recipe—I’d love to hear how much your family enjoys it!

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