01 - Pat steak cubes dry with paper towels. Evenly season with salt and black pepper.
02 - Heat olive oil in a large skillet over high heat.
03 - Place steak cubes in a single layer and sear without moving for 2-3 minutes. Flip and cook an additional 2-3 minutes until browned. Cook in batches to avoid overcrowding.
04 - Reduce heat to medium-low. Add butter and minced garlic to the skillet, stirring continuously for 1-2 minutes until butter melts and garlic is fragrant, coating the steak cubes.
05 - Sprinkle with chopped parsley and optional red pepper flakes. Toss to combine and serve immediately.