Prep The Chicken And Aromatics Pat the chicken dry with paper towels. Season both sides generously with salt and pepper. If you like, sprinkle on a little garlic powder and paprika for extra flavor. Mince your garlic. If you’re using onion or mushrooms, chop those now too. Having everything ready before the pan gets hot makes the rest of the process much smoother.

Sear The Chicken Heat the olive oil in a large, deep skillet or sauté pan over medium to medium-high heat. Add the chicken in a single layer. Let it cook without moving for about 5–6 minutes, until the underside is golden brown. Flip and cook the other side for another 5–6 minutes, until the thickest part of each piece reaches 165°F. Transfer the chicken to a plate and cover loosely with foil. This short resting time keeps it juicy. You’ll slice or cube it later.

Build The Garlic Butter Base Turn the heat down to medium. If the pan looks dry, add 1 tablespoon of the butter. Add the minced garlic (and onion or mushrooms if you’re using them) and cook for about 30–60 seconds, just until fragrant. Stir often so the garlic doesn’t brown too much. Pour in a small splash of chicken broth and use a wooden spoon to scrape up the browned bits from the bottom of the pan. That’s where a lot of the flavor is hiding.

Simmer The Noodles Right In The Pan Add the remaining chicken broth and the heavy cream. Stir and bring the mixture to a gentle simmer over medium heat. Stir in the egg noodles, making sure they’re mostly submerged in the liquid. Cover the pan with a lid and cook for about 8–10 minutes, stirring every couple of minutes so the noodles don’t stick to the bottom or clump together. If you’re adding firm vegetables like carrots or broccoli, toss them in after a few minutes so they have time to soften but don’t turn mushy. If it looks like the liquid is going away too fast, add a bit more broth or water. You’re aiming for noodles that are tender but not falling apart, surrounded by a sauce that’s a little loose in the pan. It will thicken more as it cools.

Finish With Butter, Parmesan, And Chicken Once the noodles are tender and the sauce has thickened a bit, turn the heat down to low. Stir in the remaining butter until it melts and coats the noodles. Add the Parmesan and stir again until the sauce looks glossy and creamy. Slice or cube the rested chicken and return it to the skillet. Stir it gently through the noodles and sauce, and let everything warm together for 1–2 minutes. Taste and adjust the seasoning. Add more salt, pepper, or a pinch of red pepper flakes if you want a gentle kick. Sprinkle in the chopped parsley right before serving. If you’re using spinach, this is the moment to stir it in so it just wilts without overcooking.