Oven baked 3-ingredient chicken fontaine is the kind of practical casserole-style dinner that earned a permanent place at family reunions, potlucks, and weeknight tables because it delivers a lot of comfort with very little effort. With just chicken, condensed cream of mushroom soup, and dry onion soup mix, the sauce bakes into a savory, old-school classic that feels right at home in Midwestern kitchens where simple pantry cooking still has plenty of charm.
Serve this chicken over buttered egg noodles, fluffy rice, or mashed potatoes so none of that rich mushroom-onion sauce goes to waste. A crisp green bean side, simple salad, or roasted carrots balance the richness nicely, and for a casual gathering it also works well with a basket of warm dinner rolls and iced tea.
Oven Baked 3-Ingredient Chicken Fontaine
Servings: 6
Ingredients
2 1/2 to 3 pounds bone-in, skin-on chicken pieces
2 cans (10.5 ounces each) condensed cream of mushroom soup
1 envelope (1 ounce) dry onion soup mix
Directions
1. Preheat the oven to 350°F and lightly grease a 9x13-inch baking dish or similar casserole dish.
2. Arrange the chicken pieces in a single layer in the baking dish, skin side up if using skin-on pieces.
3. In a medium bowl, stir the condensed cream of mushroom soup and dry onion soup mix together until evenly combined.
4. Spoon the soup mixture evenly over the chicken, covering the pieces as well as you can.
5. Cover the dish tightly with foil and bake for 45 minutes. Remove the foil and continue baking for 20 to 30 minutes more, or until the chicken is cooked through and the top is lightly golden and bubbling.
6. Let the chicken rest for 5 to 10 minutes before serving, then spoon plenty of sauce over each portion.
Variations & Tips
Boneless version: You can make this with boneless, skinless chicken thighs or breasts if you prefer. Start checking earlier, since boneless pieces often finish faster and can dry out if overbaked.
Smoother sauce: If you like a looser, more spoonable gravy, stir 1/2 cup water or milk into the soup before mixing in the onion soup blend. That small adjustment makes the sauce a bit more casserole-like and especially good for serving over rice or noodles.
Mushroom boost: Even though the charm of this dish is its three-ingredient simplicity, sautéed fresh mushrooms can be added for a deeper mushroom flavor when you want to dress it up for company.
Make-ahead tip: Assemble the dish several hours ahead, cover, and refrigerate until baking time. If it goes into the oven cold from the refrigerator, add a few extra minutes to the covered baking time so the chicken heats through evenly.
Best baking note: Bone-in pieces tend to stay juicier and give the sauce more flavor during baking. If you want the top more browned at the end, place the dish under the broiler for 1 to 2 minutes, watching closely so the sauce does not scorch.