Season the cubed sirloin steak generously with salt and pepper, allowing it to sit at room temperature for about 15-20 minutes.
In a large skillet, heat olive oil over medium-high heat until shimmering. If not using olive oil, you can increase the amount of butter in the next step.
Add the seasoned steak cubes in a single layer, being careful not to overcrowd the pan. Sear for 2-3 minutes per side or until they form a golden crust. Cook in batches if necessary for even cooking.
In the same skillet, reduce the heat to medium and add 2 tablespoons of butter. Once melted, add the minced garlic, rosemary, thyme, and parsley. Cook for about 1 minute until fragrant.
Return the seared steak bites to the skillet. Toss them in the garlic herb butter until well coated, then let them cook for an additional 1-2 minutes for enhanced flavor.
Transfer the garlic herb butter steak bites to a serving platter. Drizzle any remaining butter from the skillet over the top and garnish with lemon wedges.
Notes
For extra flavor, let the steak sit with salt and pepper before cooking.