1Combine steak, neutral oil, Worcestershire sauce, garlic powder, buttery steakhouse seasoning, salt, and pepper in a bowl and mix well.
2In a separate bowl, whisk together parsley, Fresno chiles, garlic, red wine vinegar, olive oil, dried oregano, kosher salt, red chili flakes, and optional lemon juice.
3Sear the steak bites in a hot oiled pan until browned.
4Add garlic & herb butter to the pan with the steak and toss.
5Mix potatoes with half-and-half, sour cream, butter, Parmesan, garlic powder, salt, and pepper to finish the mash.