Creamy Chicken Tetrazzini with Mushrooms and Peas Recipe
Introduction
Chicken Tetrazzini is a comforting, creamy pasta bake loaded with tender chicken, mushrooms, and peas. This classic dish comes together quickly and makes a satisfying meal perfect for weeknights or gatherings.

Ingredients
- ¼ cup unsalted butter
- 1 cup chopped mushrooms
- ½ medium onion, finely diced
- 1 teaspoon minced garlic
- 1 teaspoon Italian seasoning
- ¾ teaspoon salt
- ¼ teaspoon black pepper
- ¼ cup all-purpose flour
- 2 cups chicken stock
- 2 cups cream (10%-18%)
- 2 cups cooked, chopped chicken
- 1 cup frozen peas
- 375 grams dry spaghetti (about 13 oz)
- 1 cup shredded mozzarella cheese
Instructions
- Step 1: In a large skillet, melt the butter over medium heat. Add the chopped mushrooms and diced onion, sautéing until the onion is softened and the mushrooms are browned, about 5 minutes.
- Step 2: Stir in the minced garlic, Italian seasoning, salt, and black pepper, and cook for another minute until fragrant.
- Step 3: Sprinkle the flour over the mixture and stir until fully absorbed by the butter and vegetables.
- Step 4: Gradually add the chicken stock and cream, whisking constantly until the sauce is smooth. Continue cooking over medium heat while whisking frequently until the sauce thickens slightly.
- Step 5: Stir in the cooked chicken and frozen peas, mixing well to combine.
- Step 6: Preheat your oven to 400°F (200°C) if you plan to bake immediately.
- Step 7: Cook the spaghetti in a large pot of boiling salted water until just al dente. Drain well.
- Step 8: Transfer the cooked pasta to a greased 9×13-inch baking dish. Pour the sauce evenly over the pasta, using a spatula to spread and help the sauce soak in.
- Step 9: Sprinkle the shredded mozzarella cheese over the top and bake for about 20 minutes, or until the cheese is golden and bubbly.
Tips & Variations
- For extra flavor, add a splash of white wine to the sauce after sautéing the mushrooms and onions.
- Try swapping mozzarella for Parmesan or Gruyère cheese for a different taste.
- Use leftover rotisserie chicken for convenience and quick preparation.
- For a lighter version, substitute half the cream with milk or use a lower-fat cream.
Storage
Store any leftovers in an airtight container in the refrigerator for up to 3 days. Reheat covered in the oven at 350°F (175°C) until warmed through, about 15-20 minutes, or microwave individual servings until hot. This dish is not recommended for freezing due to the cream sauce texture.
How to Serve

Serve this delicious recipe with your favorite sides.
FAQs
Can I use a different type of pasta?
Yes, other pasta shapes like penne, fettuccine, or linguine work well. Adjust cooking times to keep the pasta al dente.
Is it possible to make this recipe vegetarian?
Absolutely. Replace the chicken with sautéed vegetables like zucchini, bell peppers, and additional mushrooms. Use vegetable stock instead of chicken stock for the sauce.
PrintCreamy Chicken Tetrazzini with Mushrooms and Peas Recipe
Chicken Tetrazzini is a classic creamy pasta casserole loaded with tender chicken, mushrooms, peas, and a rich, cheesy sauce baked to golden perfection. This comforting dish combines sautéed mushrooms and onions in a buttery cream sauce with garlic and Italian seasoning, layered over spaghetti and topped with mozzarella cheese for a delicious baked meal perfect for family dinners.
- Prep Time: 15 minutes
- Cook Time: 40 minutes
- Total Time: 55 minutes
- Yield: 6 servings 1x
- Category: Main Course
- Method: Baking
- Cuisine: American
Ingredients
Sauce Ingredients
- ¼ cup unsalted butter
- 1 cup chopped mushrooms
- ½ medium onion, finely diced
- 1 teaspoon minced garlic
- 1 teaspoon Italian seasoning
- ¾ teaspoon salt
- ¼ teaspoon black pepper
- ¼ cup all purpose flour
- 2 cups chicken stock
- 2 cups cream (10%-18%)
Other Ingredients
- 2 cups cooked, chopped chicken
- 1 cup frozen peas
- 375 grams dry spaghetti (about 13 oz)
- 1 cup shredded mozzarella cheese
Instructions
- Prepare the Sauce: In a large skillet, melt the unsalted butter over medium heat. Add the chopped mushrooms and finely diced onion and sauté until the onion is softened and mushrooms are browned, about 5 minutes.
- Add Seasonings: Stir in minced garlic, Italian seasoning, salt, and black pepper, cooking for about 1 minute until fragrant.
- Make the Roux: Sprinkle the all-purpose flour over the butter mixture and stir continuously until the flour is completely absorbed, forming a smooth base.
- Add Liquids: Slowly whisk in the chicken stock and cream until the sauce is smooth. Continue to cook over medium heat, whisking often until the sauce thickens slightly; it should be creamy but not overly thick.
- Combine with Chicken and Peas: Stir the cooked, chopped chicken and frozen peas into the sauce. Set aside.
- Cook the Spaghetti: Bring a large pot of salted water to a boil and cook the dry spaghetti until just al dente. Drain well.
- Assemble the Casserole: Preheat your oven to 400°F (200°C). Grease a 9×13 inch baking dish. Place the drained spaghetti into the dish and pour the prepared sauce evenly over the pasta, spreading gently with a spatula to ensure the sauce soaks through.
- Add Cheese and Bake: Sprinkle the shredded mozzarella cheese evenly over the top. Bake in the preheated oven for about 20 minutes, or until the cheese is golden, bubbly, and slightly browned around the edges.
Notes
- To save time, use leftover or rotisserie chicken for the cooked chicken component.
- You can substitute cream with half-and-half for a lighter sauce, but the texture may be less rich.
- Make sure to cook the pasta al dente as it will continue to cook slightly during baking.
- Optional: Top with breadcrumbs mixed with melted butter before baking for a crunchy topping.
- For a gluten-free version, substitute all-purpose flour with a gluten-free flour blend.
Keywords: Chicken Tetrazzini, creamy chicken pasta, baked spaghetti casserole, mushroom chicken bake, comfort food, cheesy pasta casserole

