Easy Chicken Florentine Casserole

Oven-Baked 3-Ingredient Chicken Florentine Casserole

If you love easy comfort food that requires very little preparation, this 3-Ingredient Chicken Florentine Casserole deserves a place in your recipe collection. Juicy chicken breasts are layered with creamy spinach and finished with a generous blanket of melted mozzarella, creating a warm, satisfying casserole with minimal effort.

This oven-baked chicken casserole is especially perfect for busy weeknights, Sunday dinners, potlucks, and family gatherings. There is no complicated sauce to prepare and no long list of ingredients to measure. Simply layer the ingredients in a baking dish, put everything in the oven, and let the oven transform three simple ingredients into a bubbling, golden, cheesy dinner.

The combination is incredibly comforting: tender chicken provides a hearty base, creamed spinach adds moisture and rich vegetable flavor, while melted mozzarella cheese creates the golden, creamy topping everyone loves. Serve it with rice, mashed potatoes, egg noodles, or warm bread to turn this simple casserole into a complete family meal.

Why You'll Love This 3-Ingredient Chicken Florentine Casserole

There is a reason simple casseroles remain favorites in family kitchens. They are practical, comforting, and easy to customize. This recipe takes that idea even further by using only three main ingredients.

• Only 3 ingredients: You don't need a pantry full of ingredients to make a delicious dinner.
• Easy preparation: Layer everything directly in one baking dish and let the oven do the work.
• Creamy and cheesy: Creamed spinach and melted mozzarella create an irresistibly rich topping.
• Family-friendly: The mild flavors make this an approachable dinner for both adults and children.
• Perfect for busy nights: There is very little hands-on cooking required.
• Great for gatherings: The 9x13-inch casserole makes approximately six servings.
• Easy to customize: Chicken thighs, different cheeses, and simple side dishes all work beautifully.

Ingredients for 3-Ingredient Chicken Florentine Casserole

One of the best things about this easy chicken Florentine recipe is how each ingredient has an important job. Together, these three ingredients create a complete and satisfying casserole.

1. Chicken Breasts or Chicken Tenders

You'll need 2 pounds of boneless, skinless chicken breasts or chicken tenders. Chicken provides the protein and hearty foundation of the casserole. Chicken breasts work particularly well because they are easy to arrange in a single layer and pair naturally with creamy spinach and mozzarella.

If your chicken breasts are unusually thick, slicing them horizontally or gently pounding them to an even thickness can help them cook more consistently.

2. Frozen Creamed Spinach

Use 1 package (10 to 12 ounces) of frozen creamed spinach, thawed. This convenient ingredient does double duty: it provides the spinach while also bringing a creamy texture to the casserole without requiring you to prepare a separate cream sauce.

Make sure the creamed spinach is thawed before assembling the casserole. This makes it much easier to spread evenly over the chicken.

3. Shredded Mozzarella Cheese

Add 1 1/2 cups shredded mozzarella cheese over the top. Mozzarella melts beautifully in the oven and creates the golden, bubbly finish that makes this chicken casserole so inviting.

For the best texture, freshly shredded mozzarella can melt especially smoothly, but convenient pre-shredded cheese can also be used.

How to Make Oven-Baked 3-Ingredient Chicken Florentine Casserole

Step 1: Prepare the Oven and Baking Dish

Preheat your oven to 375°F. Lightly grease a 9x13-inch baking dish or another similarly sized casserole dish.

Starting with a properly preheated oven helps the casserole cook evenly from the beginning and allows the cheese to melt into a beautifully bubbly topping.

Step 2: Arrange the Chicken

Place the boneless, skinless chicken in an even layer inside the prepared baking dish. Try not to overlap the pieces too much.

If using thick chicken breasts, slice them horizontally into thinner pieces or gently pound them to create a more even thickness. This is an important step because evenly sized chicken pieces are more likely to finish cooking at approximately the same time.

Step 3: Add the Creamed Spinach

Spoon the thawed creamed spinach over the chicken. Spread it gently with the back of a spoon so most of the chicken is covered.

The creamy spinach layer helps keep the casserole moist while adding a mild, comforting vegetable flavor. Try to distribute it as evenly as possible so every serving gets some of the creamy mixture.

Step 4: Add the Mozzarella

Sprinkle 1 1/2 cups of shredded mozzarella cheese evenly over the spinach layer. Covering the surface helps create the signature cheesy crust as the casserole bakes.

Step 5: Bake the Casserole

Place the casserole, uncovered, in the preheated oven. Bake for approximately 35 to 45 minutes, or until the chicken is fully cooked and the casserole is hot and bubbling.

The exact cooking time can vary depending on the thickness and size of your chicken pieces. Rather than relying on time alone, check the thickest part of the chicken with a meat thermometer. The chicken should reach 165°F for safe serving.

Step 6: Brown the Cheese

If you prefer a deeper golden topping, you can briefly broil the casserole for 1 to 2 minutes at the end of cooking. Watch it carefully because mozzarella can go from beautifully golden to overly browned quickly under the broiler.

Step 7: Rest and Serve

Remove the casserole from the oven and allow it to rest for approximately 5 minutes before serving. This short resting period allows the creamy layers to settle slightly and makes the casserole easier to portion.

Spoon generous portions onto plates and serve while warm, preferably with your favorite comforting side dishes.

Pro Tips for the Best Chicken Florentine Casserole

Choose Chicken Pieces of Similar Thickness

One of the easiest ways to improve this recipe is to make sure the chicken pieces are relatively similar in thickness. Very thick breasts can take considerably longer to cook than thin pieces. Slicing thick breasts horizontally or gently pounding them helps promote more even cooking.

Thaw the Creamed Spinach Completely

Thawed creamed spinach spreads much more easily than frozen spinach. Thaw it before assembling the casserole so the spinach can form an even layer over the chicken.

Don't Overlap the Chicken

Arrange the chicken in as close to a single layer as possible. Overlapping pieces can interfere with even cooking and may increase the time needed for the thickest pieces to reach the proper internal temperature.

Use a Meat Thermometer

Cooking time is only an estimate because chicken breasts vary considerably in size. For reliable results, use an instant-read thermometer and check the thickest part of the chicken. It should reach 165°F.

Protect the Cheese if Necessary

If the mozzarella becomes deeply browned before the chicken is completely cooked, loosely cover the casserole with foil for the remaining baking time. This can help prevent the cheese from becoming too dark while the chicken finishes.

Let the Casserole Rest

Don't rush straight from the oven to the table. A short 5-minute resting period gives the casserole time to settle and makes serving cleaner and easier.

Easy Variations

Although this recipe is delicious exactly as written, there are several simple ways to change it depending on your family's preferences.

Chicken Thigh Florentine

Replace the chicken breasts with boneless, skinless chicken thighs. Thigh meat tends to remain especially juicy during baking and works wonderfully with the creamy spinach topping.

Extra-Cheesy Version

For an even richer casserole, combine mozzarella with a little Monterey Jack cheese. The additional cheese creates a more indulgent topping that is particularly appealing for potlucks and family gatherings.

Kid-Friendly Spinach

If your children are hesitant about spinach, chop the thawed creamed spinach more finely before spreading it over the chicken. The spinach will blend more smoothly into the creamy layer while still adding its flavor and nutrients.

Make-Ahead Instructions

This easy baked chicken casserole can be assembled ahead of time, which makes it especially useful when you're preparing dinner for a busy evening. Assemble the chicken, creamed spinach, and mozzarella in the baking dish, then cover and refrigerate for a few hours.

When you're ready to bake, allow the chilled casserole to sit at room temperature for approximately 20 minutes before placing it in the oven. Because the chicken is starting cold, you may need to allow additional baking time. Always check the internal temperature of the thickest chicken piece rather than relying solely on the clock.

What to Serve with Chicken Florentine Casserole

This creamy chicken casserole is substantial enough to stand alone, but a few simple sides can turn it into a complete and memorable dinner.

• Buttered egg noodles: A classic pairing that catches the creamy sauce.
• Fluffy white or brown rice: Perfect for soaking up the flavorful spinach mixture.
• Mashed potatoes: An extra-comforting choice for Sunday dinner.
• Warm crusty bread: Ideal for scooping up every bit of the creamy sauce.
• Green salad: Adds a fresh, crisp contrast to the rich casserole.
• Steamed green beans: A simple vegetable side that keeps the meal balanced.
• Roasted carrots: Their natural sweetness pairs beautifully with the savory chicken.
• Fruit salad: A refreshing option for potlucks, church suppers, and family gatherings.

Frequently Asked Questions

Can I use chicken tenders instead of chicken breasts?

Yes. Chicken tenders are an excellent choice because they are naturally smaller and tend to cook more quickly. Arrange them in an even layer and check their internal temperature before serving.

Can I use chicken thighs?

Absolutely. Boneless, skinless chicken thighs are a delicious alternative and can remain particularly juicy during baking. Make sure they are arranged in a single layer and cooked to a safe internal temperature.

Can I prepare this casserole ahead of time?

Yes. You can assemble it several hours ahead, cover it, and refrigerate it until you're ready to bake. Allow the chilled casserole to sit out briefly before baking and remember that refrigerated chicken may require additional cooking time.

How do I know when the chicken is done?

The most reliable method is to check the thickest part of the chicken with a meat thermometer. It should reach 165°F. This is more dependable than judging doneness by the appearance of the cheese or the cooking time alone.

Can I make the top more golden?

Yes. Once the chicken is fully cooked, briefly broil the casserole for 1 to 2 minutes. Stay nearby and watch carefully because the cheese can brown quickly.

Recipe at a Glance

• Recipe: Oven-Baked 3-Ingredient Chicken Florentine Casserole
• Servings: 6
• Oven Temperature: 375°F
• Baking Time: Approximately 35–45 minutes
• Dish: 9x13-inch baking dish
• Main Ingredients: Chicken, creamed spinach, mozzarella
• Difficulty: Easy

Final Thoughts

When dinner needs to be simple but you still want something warm, creamy, and satisfying, this 3-Ingredient Chicken Florentine Casserole checks all the boxes. Tender baked chicken, creamy spinach, and golden melted mozzarella come together in one convenient dish, giving you the comforting flavor of a traditional family casserole without a complicated ingredient list.

What makes this recipe especially appealing is its combination of simplicity and comfort. There is no elaborate sauce to make, no complicated preparation, and very little cleanup. Just layer the three ingredients, bake until the chicken reaches 165°F and the cheese is bubbling, let it rest for a few minutes, and dinner is ready.

Whether you're looking for an easy weeknight chicken dinner, a comforting Sunday meal, or a simple casserole for a family gathering, this oven-baked Chicken Florentine is an excellent recipe to keep handy. Serve it with rice, mashed potatoes, noodles, or warm bread, and you'll have a satisfying meal that feels much more elaborate than the three-ingredient preparation suggests.

Save this easy chicken casserole recipe for the next time you need a dependable dinner with minimal effort. With its creamy spinach layer, bubbling mozzarella topping, and tender chicken, it's the kind of simple comfort food that can quickly become a regular favorite at your dinner table.