Pat the beef sirloin dry with paper towels
Season both sides with salt and black pepper
Optional: add garlic powder, onion powder, or herbs
Heat a skillet or grill over medium-high heat
Add a small amount of oil to the pan if using a skillet
Place the sirloin in the hot pan or on the grill
Cook for 3 to 5 minutes per side for medium-rare, depending on thickness
Flip only once during cooking
Check for desired doneness with a meat thermometer
Remove from heat when it reaches your preferred temperature
Let the beef rest for 5 to 10 minutes
Slice against the grain
Serve immediately