Cheesy, rich, and comforting, this Chicken Tetrazzini is a dinner that everyone will love. This baked chicken spaghetti casserole is made from scratch and comes together quickly by using cooked chicken.
Preheat the oven to 350ºF. Grease a 9x13 baking dish.
Melt the butter in a large saucepan over medium-high heat. Add the mushrooms and cook until soft, about 8 minutes. Add the garlic, salt and pepper and cook until the garlic is fragrant, about 1 minute.
Reduce the heat to medium. Sprinkle in the flour and cook, stirring for 1 minute. Gradually add the broth and the half and half, stirring until blended. Reduce the heat and simmer until thickened, 3-5 minutes.
Remove the saucepan from the heat. Add 3 cups of the cheese and stir until the cheese melts. Stir in the pasta and the chicken. Pour the mixture into the prepared baking dish.
Sprinkle the remaining 1 cup of cheese over the top of the casserole. Cover with foil and bake for 30 minutes. Remove the foil and continue to cook an additional 10-15 minutes, until the cheese is all melted and the sauce is bubbling.
Notes
Nutrition information provided as an estimate only. Various brands and products can change the counts. Any nutritional information should be used as a general guide.