Ingredients:

1 pound sirloin steak, cut into 1-inch cubes
1 tablespoon olive oil
1/2 teaspoon salt
1/4 teaspoon black pepper
1 pound small red potatoes, quartered
1/2 cup chopped onion
2 cloves garlic, minced
1 tablespoon butter
1/4 cup chopped fresh parsley

Instructions:

Heat the olive oil in a large skillet over medium-high heat.
Season the steak with salt and pepper.
Add the steak to the skillet and cook for 3-4 minutes per side, or until browned and cooked to desired doneness.
Remove the steak from the skillet and set aside.
Add the potatoes, onion, and garlic to the skillet and cook for 5-7 minutes, or until the potatoes are tender.
Add the butter and parsley to the skillet and cook for 1 minute, or until fragrant.

Return the steak to the skillet and cook for 1-2 minutes, or until heated through.
Serve immediately.