01 - Pat the sirloin cubes dry with paper towels and season them lightly with salt and black pepper.
02 - In a medium mixing bowl, combine softened unsalted butter, minced garlic, chopped parsley, chives, dill, Dijon mustard, hot sauce, smoked paprika, crushed red pepper flakes, lemon zest, lemon juice, salt, and black pepper. Stir thoroughly until the mixture is smooth and well blended. Set aside.
03 - Heat olive oil in a large skillet over medium-high heat. Once hot, add steak cubes in a single layer. Sear for 2 minutes on each side until a rich golden-brown crust forms. Work in batches if necessary to prevent overcrowding and ensure even browning.
04 - Lower the heat to medium. Return all seared steak bites to the skillet. Add the prepared cowboy butter sauce, tossing the steak to ensure even coating. Continue cooking for an additional 1 to 2 minutes until the butter has fully melted and the steak reaches the preferred doneness.
05 - Transfer the steak bites to a serving dish. Optionally garnish with extra herbs and serve immediately.