Cook your pasta as directed of package and set aside. Season your chicken breast how ever you want! You can't go wrong with a classic salt and pepper. Heat your skillet to medium, medium high. Add in 1tbsp of butter and a 1tbsp of olive oil.
When skillet is hot add you chicken breast. Cook for 3-4 minutes each side (depending how thick your chicken breast are). Set aside in foil.
Add in your mushroom (might need a little more butter or olive oil) stir around for 3-5 minutes.
Add in your onions. Season with a pinch of salt and pepper. Cook 2-3 minutes. (anytime your own looks dry add butter or olive oil)
Add your garlic, stir in for 1-2 minutes then add in your heavy cream and thyme. Give a good stir and let it reduce and thicken 7-10 minutes. Taste for seasoning (keep a eye on it, might over flow. adjust heat but keep a slight boil going)
Once it's reduced and thicken. Turn off heat and add in parsley and parmesan. Mix in well.
You can pour this over your pasta or mix pasta in sauce. Top with chicken and more parmesan! Enjoy!