This turkey tetrazzini is loaded with juicy turkey, creamy pasta, and sautéed veggies. It's the ultimate comfort food and a perfect way to use up leftover turkey!
Preheat oven to 375°F. Bring a large pot of salted water to a boil. Add the spaghetti and cook until al dente — a few minutes short of the package instructions.
Preheat a large deep pot with 4 tbsp of butter on medium-high. Add in the chopped onions and sauté until translucent, about 5 minutes. Add in the mushrooms and sauté until softened and golden.
Add the garlic and cook for another minute. Stir in the remaining 4 Tbsp of butter and the flour, and cook for a few minutes until fully incorporated.
Gradually pour in the broth and cream and simmer until thickened, about 5 minutes.
Season the mixture with salt and pepper. Mix in one cup of cheese and the cooked spaghetti and turkey, then transfer to a 9x13 inch pan (or 12 inch round pan).
Top with the remaining cheese. Bake the dish uncovered for 25- 30 minutes until golden and bubbly. Serve immediately and enjoy!