Oven-Baked 3-Ingredient Chicken Florentine Casserole
There’s something about a casserole that feels like a hug in a dish. This one has only three main ingredients, but it delivers big on flavor. The condensed soup turns into a creamy sauce right in the baking dish, the spinach softens and melds with the juices, and the chicken stays tender and moist. It’s the kind of meal that saves you on a hectic weekday—and it’s so simple, you’ll memorise it after one go.
Why You’ll Love It
Just three main ingredients – chicken, frozen spinach, and cream of chicken soup.
Built‑in sauce – no extra steps; the soup creates a creamy base as it bakes.
Tender, juicy chicken – baking under foil keeps it from drying out.
Flexible serving – spoon it over rice, egg noodles, or mashed potatoes for a heartier meal.
Ingredients
| Ingredient | Amount | Notes |
|---|---|---|
| Boneless, skinless chicken breasts | 4 (preferably similar in thickness) | If huge, slice horizontally or pound to even thickness |
| Frozen chopped spinach | 1 package (10 oz), thawed | Drain very well – squeeze out as much water as possible |
| Condensed cream of chicken soup | 1 can (10¾ oz), undiluted | Use straight from the can—do not add water or milk |
Instructions
1. Preheat and prepare
Preheat your oven to 350°F. Lightly grease a medium casserole dish or a 9×13‑inch baking dish.
2. Squeeze that spinach
This is the one step I will fuss about. Thawed spinach holds onto water like it has a personal grudge. If you don’t squeeze it dry, your casserole will be thin and watery. I put it in a clean kitchen towel and wring it out over the sink. Yes, it looks dramatic. No, I do not care.
3. Layer the base
Spread the drained spinach evenly over the bottom of the dish, breaking up any clumps with your fingers or a fork. Spoon the condensed soup over the spinach and gently spread it around so most of the spinach is covered. It doesn’t have to look perfect—it’s going in the oven, not posing for a catalog.
4. Add the chicken
Arrange the chicken breasts in a single layer over the spinach‑soup mixture, pressing each one down slightly so it settles into the sauce. If your breasts are very thick, consider butterflying them or pounding to an even thickness for more consistent cooking.
5. Bake covered
Cover the dish tightly with foil and bake for 30 minutes. The foil is essential—it keeps the chicken from drying out. Make sure the foil reaches all the edges; don’t just throw a loose little hat on top.
6. Finish uncovered
Remove the foil and bake for another 15–20 minutes, until the chicken is cooked through (internal temperature of 165°F) and the sauce is bubbling around the edges. The top will have a little color, but this isn’t a crispy‑topped casserole—it’s creamy, soft, and unapologetically comforting.
7. Rest and serve
Let the casserole sit for 5–10 minutes before serving. This gives the sauce a chance to settle instead of running all over the plate. Spoon the creamy spinach alongside each chicken breast, and if you have rice, egg noodles, or mashed potatoes, put them underneath so that sauce can do what it was born to do.
Why You’ll Love It
Just three main ingredients – chicken, frozen spinach, and cream of chicken soup.
Built‑in sauce – no extra steps; the soup creates a creamy base as it bakes.
Tender, juicy chicken – baking under foil keeps it from drying out.
Flexible serving – spoon it over rice, egg noodles, or mashed potatoes for a heartier meal.
Ingredients
| Ingredient | Amount | Notes |
|---|---|---|
| Boneless, skinless chicken breasts | 4 (preferably similar in thickness) | If huge, slice horizontally or pound to even thickness |
| Frozen chopped spinach | 1 package (10 oz), thawed | Drain very well – squeeze out as much water as possible |
| Condensed cream of chicken soup | 1 can (10¾ oz), undiluted | Use straight from the can—do not add water or milk |
Instructions
1. Preheat and prepare
Preheat your oven to 350°F. Lightly grease a medium casserole dish or a 9×13‑inch baking dish.
2. Squeeze that spinach
This is the one step I will fuss about. Thawed spinach holds onto water like it has a personal grudge. If you don’t squeeze it dry, your casserole will be thin and watery. I put it in a clean kitchen towel and wring it out over the sink. Yes, it looks dramatic. No, I do not care.
3. Layer the base
Spread the drained spinach evenly over the bottom of the dish, breaking up any clumps with your fingers or a fork. Spoon the condensed soup over the spinach and gently spread it around so most of the spinach is covered. It doesn’t have to look perfect—it’s going in the oven, not posing for a catalog.
4. Add the chicken
Arrange the chicken breasts in a single layer over the spinach‑soup mixture, pressing each one down slightly so it settles into the sauce. If your breasts are very thick, consider butterflying them or pounding to an even thickness for more consistent cooking.
5. Bake covered
Cover the dish tightly with foil and bake for 30 minutes. The foil is essential—it keeps the chicken from drying out. Make sure the foil reaches all the edges; don’t just throw a loose little hat on top.
6. Finish uncovered
Remove the foil and bake for another 15–20 minutes, until the chicken is cooked through (internal temperature of 165°F) and the sauce is bubbling around the edges. The top will have a little color, but this isn’t a crispy‑topped casserole—it’s creamy, soft, and unapologetically comforting.
7. Rest and serve
Let the casserole sit for 5–10 minutes before serving. This gives the sauce a chance to settle instead of running all over the plate. Spoon the creamy spinach alongside each chicken breast, and if you have rice, egg noodles, or mashed potatoes, put them underneath so that sauce can do what it was born to do.
Variations & Swaps
Add cheese – Scatter shredded mozzarella or Parmesan over the top during the last 10 minutes of baking for a golden finish and extra richness. Parmesan is especially nice, even the shelf‑stable kind.
Chop it up – Cut the cooked chicken into bite‑size pieces before serving, especially for kids—it makes the spinach less “suspicious” and every bite gets coated in creaminess.
Fresh spinach? – I tried it once with a giant bag of fresh spinach. It cooked down to practically nothing, released too much moisture, and left me irritated at a vegetable. Frozen chopped spinach is better here. Trust me.
Stretch it further – Serve over rice, buttered egg noodles, or mashed potatoes from the start. Green beans, roasted carrots, or a simple salad work well on the side. Warm rolls are even better for soaking up every last bit of sauce.
Storage & Reheating
Fridge – Leftovers keep well in a covered container for up to 3 days. I usually store the chicken and sauce together—separating them feels like too much work after dinner.
Reheat – Microwave individual portions until hot, stirring the spinach sauce around the chicken once or twice. For larger amounts, reheat covered in a 350°F oven until warmed through.
Final Note
This casserole is proof that you don’t need a long ingredient list or complicated steps to put a satisfying dinner on the table. It’s the kind of recipe that becomes a weeknight standby—easy, forgiving, and always welcomed. Give it a try, and don’t skip the squeezing step. Your future self (and your dinner guests) will thank you.
