Preheat your oven to 425°F for the roasted potatoes.
Wash the baby potatoes and cut in halves if they are larger; toss them with a pinch of salt, pepper, and a drizzle of olive oil on a baking sheet.
Roast the potatoes in the oven for 20-25 minutes until tender and slightly crispy.
Meanwhile, pat the sirloin steak dry and season generously with salt and pepper on both sides.
Heat a skillet over medium-high heat. Add the steak and sear for about 3-4 minutes on each side for medium-rare (adjust time based on thickness and desired doneness).
In the final minute of cooking, add the teaspoon of butter, crushed garlic, rosemary, and parsley to the pan. Spoon the herb-garlic butter over the steak to enhance the flavor.
Remove the steak from the skillet and let it rest for a couple of minutes before slicing.
Plate the steak with a side of roasted baby potatoes and drizzle any remaining herb butter from the skillet over the top.
Serve immediately and enjoy the balanced flavors and textures.