Gluten Free Chicken Tetrazzini

Total time1 hr 5 min

Prep time20 min

Cook time45 min

Tender shredded chicken gets folded into a rich, savory sauce built from sautéed leeks and cremini mushrooms, brightened with fresh thyme and a handful of sweet peas. The sauce itself is silky and deeply flavorful, thickened until it clings to every strand of pasta and baked into a bubbling casserole. A golden, crisp topping finished with nutty Parmesan gives each bite a satisfying crunch against the creamy interior. Fresh parsley stirred in right before baking keeps things bright and balances the richness of the sauce. It's a comforting, cozy casserole that reheats beautifully, making it a great weeknight staple to keep in a gluten free rotation. Each portion delivers that classic tetrazzini experience — hearty, creamy, and packed with mushroom and leek flavor in every forkful.

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Ingredients

6 servings

For the pasta

12 oz spaghetti
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For the chicken

1 ½ lb boneless, skinless chicken breasts
1 tbsp olive oil
½ tsp salt

For the sauce

4 tbsp unsalted butter
2 medium leeks, white and light green parts only, thinly sliced
10 oz cremini mushrooms, sliced
¼ cup all-purpose flour
Chef's tip
Choose a gluten-free baking blend labeled 1:1 or cup-for-cup and use the same amount. Almond and coconut flour won't work the same way.
2 ½ cups low-sodium chicken broth
1 cup whole milk
½ tsp dried thyme
½ tsp salt
½ cup frozen peas
2 tbsp fresh flat-leaf parsley, finely chopped

For the topping

½ cup grated parmesan cheese
½ cup plain breadcrumbs
Chef's tip
Panko flakes are larger and crispier than regular bread crumbs. Use the same amount for breading or crunchy toppings; crush it slightly first if the recipe needs fine crumbs for binding.
1 tbsp unsalted butter, melted

Instructions

1
Preheat the oven to 375°F (190°C). Lightly grease a 9x13-inch baking dish and set aside.
2
Bring a large pot of salted water to a boil. Cook the spaghetti until just shy of al dente — tender but with a firm, chalky center — about 1 minute less than the package directions. Drain in a colander and set aside.

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