Ingredients
Method
- Cook the pasta: Bring a large pot of salted water to a boil. Add spaghetti and cook until just al dente, about 8 minutes. Drain and toss with olive oil to prevent sticking. Set aside.
- The pasta should still have a slight bite — it will continue cooking in the sauce.
- Sauté the mushrooms: While the pasta cooks, melt butter in a large skillet over medium-high heat. Add sliced cremini mushrooms and cook without stirring for 3-4 minutes until golden on one side. Stir and cook another 3-4 minutes until browned all around.
- You should hear a good sizzle — if it's quiet, the pan isn't hot enough.
- Build the sauce: Add garlic to the mushrooms and cook 1 minute until fragrant. Sprinkle flour evenly over the top and stir constantly for 1-2 minutes until golden.
- Don't rush this step — cooking off the raw flour flavor is what gives you a smooth sauce later.
- Deglaze: Pour in sherry, scraping up any browned bits from the bottom of the pan with a wooden spoon. Let it bubble and reduce by half, about 2-3 minutes.
- The aroma will fill your kitchen — that's the sign it's ready for the next step.
- Add liquids: Slowly whisk in chicken broth, then stir in heavy cream. Add thyme and bring to a gentle simmer. Cook 5-7 minutes until the sauce coats the back of a spoon and has thickened slightly.
- Test by dipping a spoon — if you can draw a line through it with your finger without the sauce running back together, it's done.
- Combine everything: Stir in cooked spaghetti, shredded turkey, peas, and 1/2 cup Parmesan cheese. Mix until everything is evenly coated and heated through, about 3 minutes.
- The mixture should look glossy and creamy — if it seems dry, add a splash more broth or cream.
- Season and top: Taste the sauce and adjust salt and pepper as needed. Transfer to a greased 9x13-inch baking dish (or leave in the skillet for serving). Sprinkle with remaining Parmesan and panko breadcrumbs.
- The panko will toast beautifully — don't skip it.
- Bake: Bake at 375°F for 20-25 minutes until bubbly around the edges and golden on top. Let rest 10 minutes before serving to allow the sauce to set slightly.
- This resting time is crucial — cutting into a tetrazzini straight from the oven means it will slide apart.
Nutrition
Notes
There's a particular satisfaction in watching the creamy sauce cling to each bite of pasta, especially when I use rotisserie turkey from the grocery store so there's no cooking ahead. The recipe calls for mushrooms and peas, which give it texture without overwhelming the main flavors. My practical tip: don't skimp on the sherry — even a quick splash in the pan while deglazing lifts the whole dish.
I like to serve this with a simple green salad or roasted asparagus because the richness of the sauce needs something bright alongside it. It's also one of those dishes that actually tastes better the next day, which is rare for creamy casseroles.