Boil the potatoes in salted water until fork-tender, about 12–15 minutes.

Drain and let them cool slightly—warm but not steaming.

In a small bowl, whisk together olive oil, vinegar, mustard, garlic, salt, and pepper.

Pour the dressing over the warm potatoes and toss gently to coat.

Add green onions and parsley, give it one more stir, and let it sit for 10 minutes so everything soaks in.

Serve warm or chilled, whatever works best with your chaos that day.