6525 Washington St, Yountville
Biggest chocolate bar in the world
Opened in 2011, Kollar Chocolates is centrally located in Yountvillle at V Marketplace. They sell truffles, barks, and other chocolate confections online and at their European-inspired shop. I have also found their chocolates at other SFBA locations, most recently Maison Verbena in the Ferry Building.
In addition to their chocolates, Kollar sells espresso drinks and gelato at the shop. And you can watch them making chocolates in their glassed-in open kitchen.
Kollar is one of our recommended chocolatiers. Try their more adventuresome chocolates.