Warm the olive oil in a large skillet over high heat. Once the oil is hot, add the steak pieces in a single layer. Season with salt and pepper.

Let the steak cook undisturbed for about 2 minutes to develop a deep sear. Stir, then cook for another 2 minutes until browned on all sides. If your pan is small, cook in batches to avoid overcrowding.

Transfer the cooked steak to a plate. Lower the heat to medium and add the butter to the skillet.

When the butter melts, stir in the garlic and red pepper flakes. Cook for about 30 seconds, just until the garlic becomes fragrant and lightly golden.

Pour the garlic butter over the steak bites and toss to coat.

Sprinkle with parsley and serve warm.