Can I use chicken breast instead of thighs?
Yes. Pound breasts to an even thickness and sear until just browned and nearly cooked through, usually 3 to 5 minutes per side depending on thickness. Pull them a little earlier than thighs so they stay juicy, then return to the pan at the end to finish warming in the sauce.
Can I use frozen broccoli?
You can, but it releases water. Thaw and pat dry first, or roast or air-fry it separately and stir it in at the end. That keeps the sauce from turning thin.
My sauce broke or looks grainy. How do I fix it?
Lower the heat, add a splash of broth or milk, and whisk. Also make sure you add Parmesan off-heat or on very low heat and use finely grated cheese, not big shreds.
How do I know the chicken is done?
The most reliable way is a thermometer. Aim for 165°F in the thickest part. Thighs are even better around 175°F to 185°F if you have time, they get more tender.
Can I make it gluten-free?
Yep. Skip the flour, or use a gluten-free all-purpose flour blend. If you want a super reliable thickener, use a quick slurry: mix 1 teaspoon cornstarch with 1 tablespoon cold water, then stir it into the simmering sauce a little at a time until it turns silky and lightly thickened. You can also thicken the sauce by simmering a few extra minutes and finishing with more Parmesan.