Pat the steak thoroughly dry with paper towels. In a large mixing bowl, combine the 1 ¼ teaspoons Morton kosher salt, 1 teaspoon garlic powder, ½ teaspoon smoked paprika, ½ teaspoon onion powder, ½ teaspoon black pepper, and ½ teaspoon ground cumin. Add the steak and toss until evenly coated. (Note 1)
Heat a 12-inch cast-iron skillet over medium-high heat for 3 to 4 minutes, until very hot. Add 1½ teaspoons of the avocado oil and swirl to coat the bottom. The oil should shimmer but not smoke heavily.
Add half of the steak in a single layer, leaving a little space between the pieces. Sear without moving for 1 to 2 minutes. Turn the pieces and cook for another 1 to 2 minutes, until deeply browned and just shy of your desired doneness. Transfer the steak to a plate. (Notes 2 and 3)
Add the remaining 1½ teaspoons avocado oil and let it heat for about 15 seconds. Repeat with the remaining steak, then transfer it to the plate. Reduce the heat slightly if the spices begin to smoke heavily.
Remove the skillet from the heat for 2-3 minutes. This brief pause helps prevent the butter and garlic from burning.
Return the skillet to medium-low heat. Add the 2 tablespoons unsalted butter and 2 medium-large Hatch chiles. Stir until the butter melts and the chiles are heated through. Add the 3 cloves minced garlic and cook for 30 to 45 seconds, stirring constantly, just until fragrant. (Notes 4 and 5)
Return the steak and any accumulated juices to the skillet. Toss with the Hatch chile butter for 30 to 60 seconds, just until evenly coated and cooked to your desired doneness. Do not let the steak simmer in the butter.
Remove the skillet from the heat. Add the 1 tablespoon fresh lime juiceand 2 tablespoons chopped fresh cilantro and toss until evenly combined.
Immediately transfer the steak bites to a serving dish so they don’t continue cooking in the hot skillet. Let them rest for 3 minutes. Serve with toothpicks and lime wedges as an appetizer or add your favorite sides for a complete meal.