01 - Pat the steak cubes thoroughly dry with paper towels. Season evenly with salt and black pepper.
02 - Heat olive oil in a large skillet over high heat until it begins to shimmer. Add the steak cubes in a single layer, ensuring not to overcrowd the pan. Sear for 2 minutes without disturbing, then flip and cook for an additional 2 minutes. The steak should be browned on all sides and cooked to medium-rare. If necessary, cook in batches.
03 - Reduce the skillet heat to medium. Add the unsalted butter. Once fully melted, introduce the minced garlic, chopped parsley, thyme leaves, chopped rosemary, and optional red pepper flakes.
04 - Stir the ingredients to combine, tossing the steak bites in the fragrant garlic herb butter for 1 to 2 minutes, until the steak reaches your desired doneness. Remove from heat and serve immediately, spooning any accumulated garlic herb butter over the steak bites.