Pat the New York strip steak dry with paper towels to remove excess moisture.
Season generously with kosher salt, black pepper, and garlic powder on both sides, rubbing the seasonings into the steak.
Heat a cast-iron skillet over medium to high heat, add olive oil, and sear the fat cap side of the steak until golden brown to render the fat.
Flip the steak and sear the other side until golden brown, ensuring a hard sear for a crispy exterior.
Check the internal temperature of the steak (aim for 125°F for medium-rare) and continue cooking if needed.
Add butter to the skillet and baste the steak with the melted butter, spooning it over the steak several times.
Let the steak rest covered with foil for 10 minutes before slicing.
Slice the steak against the grain and serve, enjoying the juicy, flavorful medium-rare New York strip steak.
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