There are some casseroles that feel like they were made for church basements, family reunions, and long tables full of hungry people, and this oven baked 4-ingredient chicken Florentine casserole is one of them. It has that wonderfully practical 1970s charm, when a good cook could turn a few simple pantry and freezer staples into something creamy, hearty, and worth passing around twice. The spinach softens into the sauce, the chicken stays tender, and the whole dish bakes up bubbling and golden in a way that still feels every bit as comforting now as it must have back then.
This casserole is especially good with buttered egg noodles, fluffy rice, or a spoonful of mashed potatoes to catch the creamy sauce. For something fresh on the side, a crisp green salad with a tart vinaigrette or a plate of simple green beans balances the richness nicely. If you're serving it for a gathering, a basket of warm dinner rolls and a small fruit salad round the meal out in that old-fashioned, generous way.
Oven Baked 4-Ingredient Chicken Florentine Casserole
Servings: 6
Ingredients
4 cups cooked chicken, chopped or shredded
1 package (10 ounces) frozen chopped spinach, thawed and well drained
1 can (10 1/2 ounces) condensed cream of chicken soup
2 cups shredded mozzarella cheese
Directions
1. Preheat the oven to 350°F and lightly grease a 9x13-inch baking dish.
2. In a large mixing bowl, combine the cooked chicken, thawed and well-drained spinach, condensed cream of chicken soup, and 1 1/2 cups of the mozzarella cheese. Stir until everything is evenly mixed.
3. Spread the mixture evenly into the prepared baking dish and sprinkle the remaining 1/2 cup mozzarella over the top.
4. Bake uncovered for 25 to 30 minutes, until hot throughout and bubbly around the edges.
5. If you'd like a little more color on top, place it under the broiler for 1 to 2 minutes, watching carefully, until the cheese turns lightly golden.
6. Let the casserole rest for 5 to 10 minutes before serving so it sets up a bit and scoops neatly.
Variations & Tips
Add a crunchy topping: If you like a little contrast, scatter a small handful of buttered bread crumbs or crushed buttery crackers over the cheese before baking. It gives the casserole a lovely crisp top that pairs nicely with the creamy filling.
Use different cheese: Mozzarella makes a mild, stretchy topping, but Monterey Jack, provolone, or even a little Parmesan can bring more flavor. If you use a saltier cheese, taste your chicken first so the casserole stays balanced.
Make it stretch farther: This is a fine way to use leftover roast chicken or turkey, and you can spoon it over rice or noodles to feed a few extra folks. In my experience, that is exactly the kind of sensible kitchen trick that kept old family recipes in regular rotation.
Drain the spinach well: This is the best tip of the lot. Squeeze out as much liquid as you can from the thawed spinach before mixing it in, otherwise the casserole can turn watery instead of creamy.