This Chicken Florentine Casserole is a cozy, creamy bake with tender chicken, egg noodles, and spinach in a cheesy mushroom sauce. A sprinkle of Parmesan on top turns golden in the oven.

It’s ready in about 45 minutes and uses cooked chicken, so it’s a smart way to use up leftovers or a rotisserie chicken. The spinach adds color and a little extra nutrition without anyone fussing about their greens.

Why This Chicken Florentine Casserole Works

“Florentine” usually means a dish made with spinach, often in a creamy sauce. This casserole keeps that idea simple. Cream of mushroom soup and milk make a smooth sauce in seconds. Garlic powder, salt, and pepper season it, and mozzarella melts right into the noodles.

Since the chicken and noodles are already cooked, the oven only has to heat everything through and brown the top. That means the chicken stays moist and the noodles stay tender. Parmesan on top adds a salty, nutty crust that makes every scoop taste richer.

Ingredients and Easy Swaps

• Cooked chicken: Three cups, chopped. Rotisserie chicken is the fastest option. Leftover turkey also works.
• Cream of mushroom soup: One can. Cream of chicken soup is an easy swap if you’re not a mushroom fan.
• Milk: Half a cup. Any milk works. Chicken broth makes it a little lighter.
• Frozen spinach: One cup, thawed and squeezed dry. You can also use 4 to 5 cups of fresh baby spinach, wilted in a pan first.
• Cheese: Half a cup of shredded mozzarella and a quarter cup of grated Parmesan. Swiss or provolone are tasty in place of mozzarella.
• Seasoning: Garlic powder, salt, and pepper. A pinch of nutmeg goes well with spinach and cream.
• Egg noodles: Eight ounces, cooked. Penne, rotini, or bowtie pasta also work.

How to Make It at a Glance

1. Heat the oven to 350°F and grease a 9×13-inch baking dish.
2. Mix the soup, milk, garlic powder, salt, and pepper in a large bowl.
3. Stir in the chicken, spinach, cooked noodles, and mozzarella.
4. Spread it in the dish and sprinkle the Parmesan on top.
5. Bake for 25 to 30 minutes, until bubbly and golden. The center should reach 165°F.

Shortcuts for Busy Nights

This is already an easy recipe, but a little planning makes it even faster. Cook a double batch of egg noodles earlier in the week, toss them with a little oil, and keep half in the fridge for this casserole. Thaw the spinach overnight in a strainer set over a bowl, so most of the water drains on its own.

Pick up a rotisserie chicken on your way home and shred it while the noodles cook. You can also use frozen cooked chicken strips. Just thaw and chop them. With everything ready, you can have this in the oven in 10 minutes.

Common Mistakes to Avoid

Wet spinach. Frozen spinach holds a lot of water. If you don’t squeeze it out, the casserole turns soupy. Wrap it in a clean towel and twist until it’s as dry as you can get it.

Overcooking the noodles. Boil them 1 to 2 minutes less than the package says. They’ll finish softening in the oven and won’t turn mushy.

A dry casserole. Noodles soak up sauce as they bake. If your mixture looks thick before it goes in, add another splash of milk.

Too much salt. Canned soup and Parmesan are both salty. Taste the sauce before adding extra.

Variations

• Add mushrooms: Sauté 8 ounces of sliced mushrooms and stir them in.
• Crispy topping: Mix half a cup of panko with 1 tablespoon of melted butter and sprinkle it over the Parmesan.
• Sun-dried tomato: Add a quarter cup of chopped sun-dried tomatoes for color and tang.
• Bacon: Crumble cooked bacon into the mix for a smoky flavor.

What to Serve With It

This casserole is a full meal on its own, but a fresh side makes it feel complete. Try a Caesar salad, roasted green beans, or steamed broccoli. Garlic bread or warm dinner rolls are always welcome. For a lighter plate, add sliced tomatoes with a little olive oil and salt.

Make Ahead, Storage, and Reheating

Make ahead: Assemble the casserole, cover it tightly, and refrigerate for up to 24 hours. Add the Parmesan just before baking, and add 10 to 15 minutes to the bake time.

Storage: Leftovers keep in an airtight container in the fridge for up to 4 days. You can freeze the unbaked or baked casserole for up to 3 months. Thaw it overnight in the fridge.

Reheating: Add a splash of milk, cover with foil, and warm at 350°F for 15 to 20 minutes until it reaches 165°F. Single servings reheat well in the microwave.

Frequently Asked Questions

What does Florentine mean?
In cooking, it usually means a dish made with spinach. The name comes from Florence, Italy.

Can I use raw chicken?
No. The bake time is only long enough to heat cooked chicken. Cook it first by poaching, baking, or using leftovers.

Can I make it without canned soup?
Yes. Melt 3 tablespoons of butter, whisk in 3 tablespoons of flour, then slowly add 1 1/2 cups of milk or broth. Cook until thick and use it in place of the soup and milk.

Will kids eat the spinach?
Usually. The spinach blends into the creamy noodles and cheese, so it doesn’t stand out much. You can chop it extra fine if needed.