Can I use chicken breast or should I use thighs?
Chicken breast works fine as written; thighs stay juicier but require longer cooking. Pound the breast to even thickness for uniform doneness.
How do I keep the Alfredo sauce from breaking or becoming grainy?
Keep heat moderate, add butter and cheese off-heat or on very low heat, stir constantly, and use freshly grated Parmesan rather than pre-shredded.
What's the best way to cook the chicken so it doesn't dry out?
Use 1 tbsp olive oil in a hot pan, season generously, sear 6–7 minutes per side depending on thickness, then rest 5 minutes before slicing.
Can I make this ahead and reheat it?
Yes. Store pasta and chicken separately in airtight containers for up to 3 days. Reheat gently on stovetop with a splash of pasta water or milk to loosen the sauce.
Is there a dairy-free or lighter version?
Use heavy cream or half-and-half for a traditional sauce. For lighter: substitute some butter with olive oil and use lower-fat milk, though texture will be thinner.