Prep all of your vegetables. Wash and cut the mushrooms into quarters and cut green onions into 1" pieces.
Cut your meat into thin, bite size strips.
Heat your skillet on high heat, put the oil in your pan and heat until barely smoking.
Boil salted water for your pasta. Cook according to package directions.
Put in your meat and mushrooms together and sauté on high until caramelized on at least one side. Season with salt.
Next, add in the garlic, green onion, and red pepper flake. Stir around to heat, just a few seconds.
Deglaze the pan with the brandy- this step is super quick. Be sure to scrape all of the stuck bits off the bottom of the pan.
Next, add in the heavy cream and sour cream, stir to combine and reduce the sauce on high heat until thickened. This should take just a couple minutes. Season with salt and pepper.
Toss with cooked pasta and serve!