12 oz (340 g) fettuccine 1 lb (450 g) boneless skinless chicken breasts, thinly sliced 1 1 / 2 tsp kosher salt, divided 3 / 4 tsp freshly ground black pepper, divided 1 / 2 tsp garlic powder (optional) 2 tbsp (30 ml) olive oil 3 tbsp (45 g) unsalted butter, divided 3 cloves garlic, minced 1 1 / 2 cups (360 ml) heavy cream 1 cup (100 g) freshly grated Parmesan cheese, plus more for serving 1 / 4–1 / 2 cup (60–120 ml) reserved pasta water, as needed Pinch of freshly grated nutmeg (optional) 2 tbsp chopped fresh parsley 1–2 tsp lemon juice or a little lemon zest (optional)
1. Bring a large pot of well-salted water to a boil. Cook the fettuccine until just al dente. Reserve 1/2 cup of the pasta water, then drain. 2. Pat the chicken dry. Season with about 1 tsp salt, 1/2 tsp pepper, and the garlic powder if using. 3. Heat the olive oil and 1 tbsp butter in a large skillet over medium-high heat. Cook the chicken in a single layer (in batches if needed) until golden and cooked through, 4–6 minutes total. Transfer to a plate and tent loosely. 4. Reduce heat to medium-low. Add the remaining 2 tbsp butter to the skillet. Stir in the garlic and cook until fragrant, 30–60 seconds (do not brown). 5. Pour in the heavy cream. Bring to a gentle simmer, stirring, for 2–3 minutes until slightly thickened. Season with the remaining 1/2 tsp salt, 1/4 tsp pepper, and a pinch of nutmeg if using. 6. Whisk in the Parmesan a handful at a time until melted and smooth. If the sauce is too thick, loosen gradually with reserved pasta water; if too thin, simmer briefly to reduce. 7. Return the chicken and any accumulated juices to the skillet. Add the drained fettuccine and toss to coat evenly. Cook 1 minute so the pasta absorbs the sauce. 8. Taste and adjust seasoning. Add a squeeze of lemon juice or a little zest if you want extra brightness. 9. Remove from heat. Sprinkle with parsley and extra Parmesan. Serve immediately.
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