Creating Easy Chicken Tetrazzini is a breeze when you follow these straightforward steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C).
2. Cook Pasta: In a large pot, cook spaghetti or fettuccine according to package instructions until al dente. Drain and set aside.
3. Sauté Vegetables: In a large skillet, heat olive oil over medium heat. Add chopped onion, garlic, and mushrooms. Sauté until softened, about 5-7 minutes.
4. Make the Sauce: Sprinkle flour over the sautéed vegetables and stir for 1-2 minutes. Gradually pour in chicken broth while whisking. Then, add heavy cream, salt, black pepper, garlic powder, and paprika. Continue to stir until the sauce thickens, about 4-5 minutes.
5. Combine Ingredients: Add the cooked chicken, peas, and drained pasta to the sauce. Stir to combine until everything is coated nicely.
6. Transfer to Baking Dish: Pour the mixture into a greased 9×13-inch baking dish, spreading it evenly.
7. Top with Cheese: Sprinkle Parmesan and mozzarella cheese evenly over the top.
8. Bake: Place the baking dish in the preheated oven and bake for 20-25 minutes or until the cheese is bubbly and golden.
9. Garnish and Cool: Remove from oven, let cool for a few minutes, and garnish with fresh parsley if desired.

By following these simple steps, you’ll have a comforting dish that’s sure to impress!