season all sides of the tenderloin with the salt, pepper and garlic powder
place tenderloin in a small dish with sides and add the Worcestershire sauce making sure all sides are well coated
cover with plastic wrap and marinade at room temperature for about 30 mins
preheat the oven to 500
heat 2 tablespoons of avocado oil in a large skillet on high heat until the oil is very hot
remove tenderloin from the marinade and pat dry with a paper towel being sure to remove excess moisture (this will help get a good crust)
add a pinch of salt and sear the tenderloin on all sides for 2 mins per side (including the ends)
after the tenderloin has been seared, top with 2 tablespoons of butter and place the whole skillet in a 500 degree oven
cook for 16 mins for med/rare
let meat rest on a plate (off of the heat) for 10 minutes before slicing