Keto Chicken Florentine Casserole (2024)

Tender chicken, sautéed mushrooms and healthy spinach baked in a rich cheesy sauce makes this Keto Chicken Florentine Casserole your new favorite easy dinner!

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❤️ Why You'll Love This Chicken Florentine Casserole

• Tender chicken, sautéed mushrooms and healthy spinach
• Rich and creamy cheese sauce
• Baked with melted mozzarella cheese on top
• Loaded with healthy fats
• Easy to prepare, even make it ahead and bake when you're ready

This is one of my very favorite casseroles to make! If you need a last minute Low Carb dinner recipe, this Chicken Florentine casserole can be made with ingredients you might already have on hand!

One of the best things about casseroles, is they are typically very easy to put together and often have a fair amount of servings. This is great for anyone who struggles with meal prepping and having enough Keto meals on hand.

When you bake this chicken florentine, your kitchen is going to smell amazing!! You will find yourself making this one again and again! It also freezes perfectly, so don't let your leftovers go to waste!

🛒 Ingredients For Keto Chicken Casserole

• Cooked Chicken
• Mushrooms
• Frozen spinach
• Heavy cream
• Mascarpone cheese
• Parmesan cheese
• Mozzarella cheese
• Garlic
• Butter
• Salt
• Pepper

*Exact measurements are listed in the recipe card below.

🥣 Recommended Tools

• Casserole baking dish
• Mixing bowl

🔪 How to Make Chicken Florentine Casserole

Preheat oven to 375°F.

Heat a skillet to medium and add in the butter, then once melted, add in the mushrooms.

Sauté for a few minutes and once they have some good color, add in the garlic.

Sauté for about 15 seconds, then add in the mascarpone cheese, turn off the heat and stir until melted. Remove from the heat and allow to cool slightly.

In a large mixing bowl, add in the chicken, spinach, grated parmesan cheese salt and pepper.

Add in the heavy cream, half the mozzarella cheese and the mushrooms, garlic and mascarpone mixture.

Stir until well combined, then pour into a 9 x 9 casserole baking dish that's been sprayed with nonstick spray.

Add the remaining mozzarella cheese over the top.

Bake for 30 minutes or until the cheese is golden.

💡 Tips for Making Keto Chicken Casserole

• This can be a great make-ahead dinner, especially for busy weeknights. Simply prepare the ingredients, mix together and add them to the casserole dish. Then store in the fridge, top with the shredded mozzarella cheese and bake when you're ready.
• To make your life easier, you can pick up a rotisserie chicken, shred it up and use it in this recipe. It's definitely a time-saver, verses cooking your own chicken.

☑️ Storage Instructions

Store leftovers in an airtight container in a fridge for a few days or freeze.

🍴 What to Serve with Chicken Florentine

Since this Keto casserole is rich in flavor and healthy fats, a simple side salad would be the most suitable pairing. Greek Salad, Classic Wedge Salad, Mediterranean Cucumber Salad or this Strawberry Spinach Salad are all great options.

🔄 Substitutions and Additions

• Chicken: As I mentioned above, using store bought rotisserie chicken is a great time saver.
• Mushrooms: Fresh mushrooms are best and have the most flavor, but in a pinch, you can use jarred/canned mushrooms.
• Onions or Leeks: For added flavor, you can sauté some yellow onions or leeks along with the mushrooms and add them into the casserole.
• Cheese: If you're out of parmesan cheese, Romano or Asiago will work just as well. Provolone or Monterey Jack also makes a great replacement for the mozzarella cheese.
• Spinach: If you happen to have fresh spinach on hand, you can sauté it in the skillet before adding it to the casserole. Just be sure to make a LOT, we know how spinach shrinks down to almost nothing once cooked!
• Mascarpone: If you don't have mascarpone cheese, cream cheese will work as well. Just be sure to adjust your macros accordingly, since cream cheese has slightly more carbs.

What is chicken Florentine made of?

The main components are spinach, chicken of course and a cream sauce. Garlic and a blend of cheeses give it great flavor, while the mushrooms make it hearty, filling and very tasty.

How many carbs are in chicken Florentine?

There are only 3 net carbs in each serving of this chicken Florentine casserole.

What kind of chicken can I eat on Keto?

The best thing about chicken on a Keto diet is that all parts, breast, thighs, legs and wings are perfectly suitable!

What is the origin of chicken Florentine?

While one might think it originated in Florence, Italy because of the name, it's not Italian, it's actually French.

Why is spinach associated with Florence?

Chicken Florentine originated in 1533when Catherine de Medici, a Florentine aristocrat, married a French prince and brought her recipes and love for spinach to France, or so the story goes. When you see "Florentine" recipes, they most often contain spinach as a main ingredient.

🍽️ More Keto Casseroles

• Chicken Parmesan Casserole
• Loaded Creamy Cauliflower Casserole
• Chicken Cordon Bleu Casserole
• Easy Sausage and Pepper Breakfast Casserole
• Chicken Broccoli Casserole
• Chicken Alfredo Casserole

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*Originally published on August 14, 2018, updated on February 13, 2024 with improvements to the recipe, photos, new recipe information and helpful tips.