Heat the olive oil in a large pan over high heat. Season the steak with salt and pepper to taste.
Place the steak in the pan in a single layer; you may have to work in batches depending on the size of your pan. Cook for 3-4 minutes, stirring occasionally, until golden brown. Repeat with remaining meat if needed.

Add the butter and garlic to the pan; cook for 1-2 minutes, stirring to coat the meat in the sauce.
Sprinkle with parsley and serve.
NOTES
If you don’t have sirloin, you can also use tenderloin, rib eye, or strip steak.

Heat the olive oil in a large pan over high heat. Season the steak with salt and pepper to taste.
Place the steak in the pan in a single layer; you may have to work in batches depending on the size of your pan. Cook for 3-4 minutes, stirring occasionally, until golden brown. Repeat with remaining meat if needed.

Add the butter and garlic to the pan; cook for 1-2 minutes, stirring to coat the meat in the sauce.
Sprinkle with parsley and serve.
NOTES
If you don’t have sirloin, you can also use tenderloin, rib eye, or strip steak.