01 - Pat steak cubes dry with paper towels, then season evenly with kosher salt and black pepper.
02 - Heat olive oil in a large skillet over high heat until shimmering. Add steak cubes in a single layer and sear, undisturbed, for 2 minutes.
03 - Flip steak bites and continue cooking for 1 to 2 minutes until browned and desired doneness is achieved. Transfer steak bites to a plate and set aside.
04 - Reduce heat to medium. In the same skillet, add unsalted butter and let it melt. Add minced garlic and cook for 30 seconds until fragrant.
05 - Return steak bites to the skillet. Toss thoroughly to coat in the garlic butter for 1 minute.
06 - Sprinkle with chopped parsley and crushed red pepper flakes if using. Serve immediately.