Recipe for Chicken Tetrazzini With Cream of Mushroom Soup: Nostalgic Bake With a Creamy Twist

This comforting casserole brings together tender chicken, al dente pasta, and a creamy mushroom sauce for a satisfying meal. I developed this version to capture that nostalgic flavor with minimal effort.

The secret lies in combining cream of mushroom soup with a splash of milk for extra richness. Layered with shredded chicken and spaghetti, then topped with melted cheese, it bakes into a golden, bubbling dish.

What emerges from the oven is a creamy, hearty bake with perfectly coated noodles and juicy chicken pieces. The sauce thickens beautifully during baking, creating that classic tetrazzini texture.

Perfect for family dinners or potlucks, this dish delivers on comfort without complicated techniques. The oven does most of the work while you enjoy the aroma.

Ingredients for Recipe for Chicken Tetrazzini with Cream of Mushroom Soup

Pantry staples and a few fresh additions bring this hearty bake to life.

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The cream of mushroom soup is non-negotiable here—Campbell’s or Progresso are the most reliable (trust me on this). For the chicken, I grab boneless, skinless breasts from Costco and poach them myself—saves money and tastes better than rotisserie. The spaghetti should be cooked just shy of done so it finishes perfectly in the bake. Barilla or De Cecco hold up best to the saucy treatment.

No cream of mushroom? Cream of chicken plus sautéed mushrooms gets close. Out of sour cream? Greek yogurt at full-fat works in a pinch (just stir it in off-heat). Fresh mushrooms are ideal, but canned mushrooms drained well are fine if that’s what you’ve got. Want extra richness? Swap milk for half-and-half. The thyme can be fresh at double the amount.

Assemble and bake right away, or refrigerate the casserole overnight—24 hours max—for better flavor development. Leftovers keep 4-5 days in the fridge and reheat beautifully. Freezes for 3 months if you want to make a double batch (worth the extra effort).

Step-by-Step Instructions for Chicken Tetrazzini With Cream of Mushroom Soup

Here’s the method I use to create this creamy, comforting bake with perfect consistency every time.

Step 1: Cook and Shred the Chicken

Start by poaching the 1.5 lb boneless skinless chicken breasts in simmering chicken broth for 12-15 minutes until fully cooked through. I like to keep the broth at a gentle simmer—too vigorous and the meat can turn tough.

You’ll know it’s done when the internal temperature reaches 165°F and the juices run clear. Remove the chicken from the broth and let it cool slightly before shredding. Reserve the broth for later use—it’ll add depth to the sauce. Shred the chicken into bite-sized pieces using two forks for a rustic texture.

Step 2: Sauté the Vegetables for Depth

In a large skillet, melt the 2 tbsp unsalted butter over medium heat. Add the 1 whole yellow onion (finely diced) and sauté for 3-4 minutes until translucent. Then add the 8 oz fresh mushrooms (sliced) and cook for another 5-6 minutes until they release their moisture and turn golden brown.

Stir in the 2 cloves garlic cloves (minced) and 0.5 tsp dried thyme, cooking for 30 seconds until fragrant. This builds a flavorful base for the creamy sauce. Sprinkle the 2 tbsp all-purpose flour over the vegetables, stirring to coat evenly, and cook for 1 minute to remove the raw flour taste.

Step 3: Build the Creamy Sauce

Slowly whisk in the reserved chicken broth and 1 cup whole milk to avoid lumps. Add the 2 cans cream of mushroom soup, stirring until smooth. Bring the mixture to a gentle simmer and let it thicken for 3-4 minutes, stirring occasionally.

Once thickened, reduce the heat to low and stir in the 0.5 cup sour cream and 1 cup shredded cheddar cheese (reserving the other 1 cup for topping). Season with 1 tsp kosher salt and 0.5 tsp ground black pepper. Taste and adjust seasoning if needed—this is your chance to balance the flavors perfectly.

Step 4: Assemble and Bake

In a large bowl, combine the shredded chicken, 8 oz spaghetti (cooked al dente and broken in half), and the creamy sauce. Mix until everything is evenly coated. Transfer the mixture to a greased 9×13-inch baking dish, spreading it out in an even layer.

Sprinkle the remaining 1 cup shredded cheddar cheese over the top. Bake in a preheated 375°F oven for 20-25 minutes until the casserole is bubbly and the cheese is golden and melted. Let it rest for 5 minutes before serving to allow the sauce to set slightly.

Troubleshooting recipe for chicken tetrazzini with cream of mushroom soup

Sauce Too Thin

If your sauce isn’t thickening, simmer it uncovered for an extra 3-5 minutes. I often add a slurry of 1 tbsp flour mixed with 2 tbsp cold milk, whisking constantly until it reaches the right consistency. 💡

Dry Casserole

Overbaking can dry it out. Cover with foil if the top browns before 20 minutes. For already dry leftovers, stir in ¼ cup milk or broth before reheating to restore creaminess.

Pasta Mushy

Cook spaghetti just 1-2 minutes less than package instructions. It’ll finish in the oven. If it’s already overcooked, rinse under cold water to stop cooking before mixing with sauce.

Cheese Not Melting

Pre-shredded cheese often contains anti-caking agents. For best results, grate block cheddar yourself. Also, ensure the casserole is fully baked—25 minutes at 375°F usually does the trick. 🔥

Bland Flavor

Boost with ½ tsp garlic powder or 1 tsp Worcestershire sauce. A pinch of smoked paprika adds depth. Taste before baking and adjust—it’s easier to fix then than after!

Sauce Separating

This happens if the sauce boils too vigorously. Keep it at a gentle simmer and stir frequently. If it separates, whisk in 1 tbsp cold butter to emulsify it back together.

Frequently Asked Questions