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Preheat your oven to 375°F. Lightly grease a 9x13 inch baking dish.

Bring a large pot of generously salted water to a rolling boil. Add the spaghetti (or egg noodles) and cook according to package directions until al dente. Drain well and set aside.

While the pasta cooks, melt 1/4 cup of unsalted butter in a large skillet or Dutch oven over medium heat. Add the diced yellow onion and sliced cremini mushrooms, cooking until softened, about 5-7 minutes. Add the minced garlic and cook for another minute until fragrant.

Sprinkle the all-purpose flour over the onion and mushroom mixture, stirring constantly for 1 minute to create a roux. Gradually whisk in the chicken broth, then the whole milk, stirring until the sauce thickens and is smooth. If using, stir in the dry sherry.

Remove the skillet from the heat. Stir in the cooked turkey, frozen peas, 1/2 cup of grated Parmesan cheese, 1 teaspoon of kosher salt, and 1/2 teaspoon of black pepper. Add the drained pasta to the sauce and toss gently to combine all ingredients thoroughly.

Transfer the pasta mixture to the prepared baking dish. In a small bowl, combine the Panko breadcrumbs, 1/4 cup of grated Parmesan cheese, and 2 tablespoons of melted unsalted butter. Sprinkle this topping evenly over the tetrazzini.

Bake for 25-30 minutes, or until the sauce is bubbly and the topping is golden brown and crispy. Let stand for 5 minutes before serving.


Preheat your oven to 375°F. Lightly grease a 9x13 inch baking dish.

Bring a large pot of generously salted water to a rolling boil. Add the spaghetti (or egg noodles) and cook according to package directions until al dente. Drain well and set aside.

While the pasta cooks, melt 1/4 cup of unsalted butter in a large skillet or Dutch oven over medium heat. Add the diced yellow onion and sliced cremini mushrooms, cooking until softened, about 5-7 minutes. Add the minced garlic and cook for another minute until fragrant.

Sprinkle the all-purpose flour over the onion and mushroom mixture, stirring constantly for 1 minute to create a roux. Gradually whisk in the chicken broth, then the whole milk, stirring until the sauce thickens and is smooth. If using, stir in the dry sherry.

Remove the skillet from the heat. Stir in the cooked turkey, frozen peas, 1/2 cup of grated Parmesan cheese, 1 teaspoon of kosher salt, and 1/2 teaspoon of black pepper. Add the drained pasta to the sauce and toss gently to combine all ingredients thoroughly.

Transfer the pasta mixture to the prepared baking dish. In a small bowl, combine the Panko breadcrumbs, 1/4 cup of grated Parmesan cheese, and 2 tablespoons of melted unsalted butter. Sprinkle this topping evenly over the tetrazzini.

Bake for 25-30 minutes, or until the sauce is bubbly and the topping is golden brown and crispy. Let stand for 5 minutes before serving.
