Allow steaks to sit out at room temperature for up to one hour.
Brush steaks on both sides with oil.
Sprinkle both sides of each steak with about 1 teaspoon of seasoning. Pat.
Heat remaining oil in heavy skillet over medium high heat.
Sear steaks in skillet 1-2 minutes on each side.
Insert a probe thermometer in steak and finish cooking over indirect heat on grill or in a 250 degree oven until desired level of doneness.
Remove from heat and top each steak with half of the butter. Allow to rest 2-3 minutes before serving.
Notes
For homemade blackened seasoning use this recipe. Purchased seasoning may be used instead.
A high smoke point oil like safflower or canola oil is recommended.
Cayenne pepper may be adjusted in the seasoning for desired level of spiciness, and additional cayenne may be added to store bought seasoning for extra heat.
Butter may be salted or unsalted, and is an optional ingredient.