Pat the beef cubes dry with a paper towel and season evenly with salt and black pepper.

Heat olive oil in a large cast-iron skillet over high heat until smoking.

Add the seasoned beef cubes in a single layer and sear for 2 minutes per side until a brown crust forms.

Reduce heat to medium-low, add butter and minced garlic to the skillet, and cook for 1 minute until fragrant.

Toss the meat in the garlic butter sauce, remove from heat, and garnish with chopped fresh parsley before serving.