Roasted Baby Potatoes with Mustard Aioli & Onion Jam

White baby potatoes. Cut an "X" in the top of each potato. Do not cut all the way through the potato, just enough to make a small crown-like opening. You can also cut a small slice off the bottom of the potatoes if they are really round and roll too much. Drizzle the potatoes with oil, salt, and pepper and roast at 425◦F until tender. They can be prepared ahead of time up to this point.
Fill the centers of the potatoes with onion jam and pop back in the oven to heat through. Remove from oven and top with a dollop of mustard aioli and two thin slices of chives.