large egg, lightly beaten
Combine first four ingredients in a medium bowl; make well in center.
Split vanilla bean, and scrape seeds into a small bowl; whisk in milk, oil, and egg until blended.
Add to well in dry ingredients, stirring until just blended.
Drop batter by 1/4 cupfuls onto a lightly greased hot griddle, cooking until the top is covered with bubbles. Turn pancakes and cook other side.