One hour prior to cooking, remove bison tenderloin steaks from the refrigerator. Pat them dry & sprinkle them with coarse sea salt on both sides. Let them sit at room temperature for one hour. See notes if house is warm.
4 bison tenderloin steaks, coarse salt
While the steaks are resting, mix together the softened butter, minced garlic, and dried herbs. Set this aside until it is time to cook the steaks.
3-4 tbsp butter, 2-3 cloves garlic, 1/2 tsp dried rosemary, 1/2 tsp dried thyme
Toward the end of the resting time, preheat the oven to 400°F. Place an oven -safe skillet, such as cast iron, on your stove top and heat it to medium-high until nice and hot.
Once the pan is nice and hot, add 2 to 3 tablespoons of avocado oil to the skillet. Once the oil spreads and glistens, add the steaks to the pan and leave them undisturbed for 2 to 3 minutes.
2-3 tbsp avocado oil
Flip the steaks over using some tongs. Add the garlic butter to the pan and let it melt. Tip the pan so the butter pools to one end. Using a spoon, scoop the butter mixture over the steaks repeatedly for about 2 minutes. Turn the heat down if needed so the garlic and butter don't burn.
Turn off the stove and carefully move the oven-safe skillet into the oven for the bison tenderloin to finish cooking. Cook at 400°F for 3-5 minutes-- 3 minutes for rare, 4 for medium rare, 5 for medium. Check the internal temp with a thermometer--you want to pull them out about 5 degrees cooler than your desired final temp. See notes for final cooking temperature suggestions.
Let steaks rest 5-10 minutes before slicing so the juices can reabsorb.