Chicken Casserole with Creamy Mushroom Sauce

This easy 3-ingredient chicken casserole turns a few simple ingredients into a creamy, comforting dinner with almost no hands-on work. Chicken breasts bake in a rich mushroom and sour cream sauce that thickens beautifully in the oven, so there’s no need to make a separate sauce on the stovetop.

It’s an ideal easy chicken dinner for busy weeknights, but the creamy presentation also makes it a great choice for family gatherings, potlucks, church dinners, and casual entertaining.

Serve this creamy baked chicken over mashed potatoes, buttered egg noodles, or white rice to soak up every bit of the savory mushroom sauce.

Servings: 6
Prep Time: 10 minutes
Cook Time: 50–55 minutes
Resting Time: 5–10 minutes

Ingredients

• 2½–3 pounds boneless, skinless chicken breasts
• 2 cans (10.5 ounces each) condensed cream of mushroom soup
• 1 cup sour cream
• Optional: fresh parsley or black pepper for serving

How to Make 3-Ingredient Chicken Casserole

1. Preheat the oven.
   Heat your oven to 350°F (175°C). Lightly grease a 9×13-inch casserole dish.
2. Prepare the chicken.
   Pat the chicken breasts dry. If they are particularly thick, carefully slice them horizontally so the pieces are more even in thickness and cook more consistently.
3. Make the creamy sauce.
   Add the cream of mushroom soup and sour cream to a bowl. Stir until well combined. The mixture will be thick—there is no need to add water or milk.
4. Assemble the casserole.
   Arrange the chicken in a single layer in the prepared baking dish. Pour the creamy mushroom mixture over the chicken and spread it evenly.
5. Bake covered.
   Cover the casserole tightly with aluminum foil and bake for 35 minutes. The covered baking time helps keep the chicken moist while the sauce develops.
6. Finish uncovered.
   Carefully remove the foil and return the casserole to the oven. Continue baking for 15–20 minutes, until the sauce is bubbling and the chicken reaches an internal temperature of 165°F (74°C).
7. Let it rest.
   Remove the casserole from the oven and allow it to rest for 5–10 minutes. The sauce will thicken slightly as it cools.
8. Serve.
   Spoon the creamy sauce generously over each chicken breast. Garnish with fresh parsley or freshly ground black pepper if desired.

Why You’ll Love This Easy Chicken Casserole

• Only 3 main ingredients: A simple recipe when you want dinner without a long shopping list.
• Minimal prep: The creamy sauce comes together in just a couple of minutes.
• One-dish dinner: Everything bakes together in a single casserole dish.
• Creamy and comforting: Mushroom soup and sour cream create a rich, savory sauce.
• Great for families: The mild flavors make this an easy chicken dinner for a variety of tastes.
• Perfect for meal planning: Leftovers can be refrigerated and reheated for another meal.
• Easy enough for weeknights: Most of the cooking time is hands-off.

What to Serve with Creamy Chicken Casserole

This creamy chicken casserole pairs especially well with foods that can absorb the sauce. Try it with:

• Mashed potatoes
• Buttered egg noodles
• White rice
• Steamed green beans
• Roasted broccoli
• Simple green salad
• Warm dinner rolls
• Crusty bread

For a complete family dinner, serve the chicken with a green vegetable and mashed potatoes or rice.

Easy Variations

Cream of chicken: Replace the cream of mushroom soup with cream of chicken soup for a milder flavor.

Mushroom lovers: Add 1–2 cups of sliced fresh mushrooms before pouring the sauce over the chicken.

Chicken thighs: Boneless, skinless chicken thighs work well if you prefer darker meat. Check the internal temperature before serving.

Greek yogurt: For a slightly tangier sauce, replace half of the sour cream with plain Greek yogurt.

Extra seasoning: Add a little onion powder, dried parsley, or black pepper to the sauce while keeping the basic 3-ingredient recipe intact.

Helpful Tips

• Choose chicken breasts that are similar in size so they cook evenly.
• Do not thin the condensed soup with milk or water; the chicken releases moisture as it cooks.
• Cover the dish tightly during the first part of baking to help prevent the chicken from drying out.
• Always check the thickest part of the chicken with an instant-read thermometer.
• The chicken should reach 165°F (74°C) before serving.
• Letting the casserole rest for a few minutes helps the creamy sauce become thicker and cling to the chicken.

Storage and Reheating

Refrigerate leftover chicken casserole in a shallow, covered container within 2 hours of cooking. Store it in the refrigerator for up to 3–4 days.

Reheat individual portions until they are thoroughly hot. If the sauce becomes too thick after refrigeration, a small splash of milk or broth can help loosen it during reheating.