Step 1 of 13
Chicken Tetrazzini
Preheat the oven to 375°F.
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Step 2 of 13
Chicken Tetrazzini
Spray a 9x13-inch baking dish with nonstick cooking spray. Set aside.
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Step 3 of 13
Chicken Tetrazzini
Bring a large pot of water to a boil and add a generous pinch of salt. Once boiling, add the spaghetti to the water. Cook, stirring occasionally, until the pasta is al dente, 9-10 minutes. Drain the pasta in a large colander, and rinse thoroughly with cold water. While the pasta cooks, prepare the vegetables and sauce.
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Step 4 of 13
Chicken Tetrazzini
Finely chop the onion, carrot, and celery. Slice the mushrooms. Mince the garlic.
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Step 5 of 13
Chicken Tetrazzini
Set a large pot over medium-high heat and add the butter. Once melted, add the onions, carrot, celery, and mushrooms. Saute until the vegetables are browned and softened, 6-7 minutes. Add the minced garlic and continue cooking until fragrant, about 30 seconds. Add the peas and pour in the wine. Stir for a minute to thaw the peas and deglaze the bottom of the pot.
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Step 6 of 13
Chicken Tetrazzini
Sprinkle the flour into the pot and stir to coat the vegetables. Slowly pour in the chicken broth, stirring to dissolve the flour. When no lumps remain, pour in the half-and-half while continuing to stir.
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Step 7 of 13
Chicken Tetrazzini
Cook the sauce, stirring constantly, until it begins to bubble and thicken. Once thickened, turn off the heat. Stir in the Parmesan cheese, salt, and black pepper. Once the cheese is mostly melted, fold in the chicken and cooked spaghetti until thoroughly coated in sauce.
PRO TIP Taste your sauce while you're cooking to see if you like it! For a slightly lower sodium option, use a little less Parmesan and/or salt.
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Step 8 of 13
Chicken Tetrazzini
Pour the chicken tetrazzini into the prepared baking dish.
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Step 9 of 13
Chicken Tetrazzini
Place the crushed cracker crumbs and Parmesan cheese in a mixing bowl and pour in the melted butter. Mix with a fork until the crumbs are evenly moistened.
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Step 10 of 13
Chicken Tetrazzini
Sprinkle the crumbs in an even layer over the casserole.
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Step 11 of 13
Chicken Tetrazzini
Bake the casserole on middle rack of oven until topping is deeply golden and the dish bubbles at the edges, 30-40 minutes.
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Step 12 of 13
Chicken Tetrazzini
Check to see that casserole is done. Remove from oven or add time as needed.
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Step 13 of 13
Chicken Tetrazzini
Allow the casserole to rest for 10-15 minutes before serving.