Pat the steak dry with paper towels and season all over with salt.
Heat olive oil in a large cast-iron skillet over medium-high heat. Once the oil is glistening, add the steak in a single layer, making sure they aren’t touching, and cook undisturbed until browned, 1-2 minutes. Flip and repeat on the other side, about another 6 minutes. Transfer to a serving plate.
Reduce the heat to low and add the butter to the pan. Once the butter has melted, add the garlic and cook until fragrant, about 30 seconds.
Pour the garlic butter over the steak bites and sprinkle with pepper. Serve alongside garlic aioli for dipping.
NOTE: You may have to work in batches when cooking the steak! Just be sure to remove the first batch from the pan before cooking the remaining steak.
