This oven baked 3-ingredient chicken Florentine casserole is the kind of simple comfort food that earns a permanent spot in a family recipe box. It has that classic church-supper appeal: tender chicken, creamy spinach, and a golden cheesy finish that feels a little special without taking much effort at all. Recipes like this became popular because they rely on a few convenient ingredients and turn them into something warm, hearty, and dependable for potlucks, weeknight dinners, and make-ahead meals.
Serve this casserole with buttered egg noodles, fluffy rice, or mashed potatoes to soak up the creamy spinach sauce. A crisp green salad, roasted carrots, or steamed green beans help balance the richness, and if you are bringing it to a luncheon or casual gathering, a basket of soft dinner rolls makes it stretch even further.
Oven Baked 3-Ingredient Chicken Florentine Casserole
Servings: 6
Ingredients
2 pounds boneless, skinless chicken breasts or chicken tenders
1 package frozen creamed spinach, about 20 ounces, thawed
1 1/2 cups shredded mozzarella cheese
Directions
1. Preheat the oven to 375°F and lightly grease an oval or 9x13-inch baking dish.
2. Arrange the chicken in an even layer in the baking dish. If the pieces are very thick, cut them into smaller portions so they cook evenly.
3. Spoon the thawed creamed spinach over the chicken and spread it gently to cover the pieces as evenly as possible.
4. Sprinkle the mozzarella cheese evenly over the top.
5. Bake uncovered for 35 to 45 minutes, or until the chicken is fully cooked and the cheese is melted, bubbly, and lightly golden on top. If needed, broil for 1 to 2 minutes at the end for extra color.
6. Let the casserole rest for 5 minutes before serving so the sauce settles slightly. Spoon onto plates and serve hot.
Variations & Tips
Add seasoning: If you want a little more flavor while still keeping it easy, add a sprinkle of garlic powder, black pepper, or Italian seasoning over the chicken before topping with the spinach.
Use different cheese: Mozzarella keeps the casserole mild and melty, but Monterey Jack, provolone, or a light sprinkle of Parmesan on top can give it a slightly different finish.
Make it potluck-friendly: You can assemble the casserole a few hours ahead, cover it, and refrigerate it until you are ready to bake. If it goes into the oven cold, add a few extra minutes to the baking time.
Check for doneness: Because chicken breasts vary so much in thickness, the most reliable way to know it is done is to check that the thickest pieces reach 165°F in the center.
Try a heartier version: For a fuller one-dish meal, layer the casserole over cooked rice or egg noodles before baking. The sauce soaks in nicely and makes it feel like an old-school company dinner.