Heat a lightly oiled griddle over medium-low heat.
In a bowl, mix the flour, oats, baking powder, baking soda, and cinnamon. In a separate bowl, mix applesauce, sour cream, egg, and vanilla. Stir applesauce mixture and milk into the flour mixture until evenly moist and thick.
Scoop about 1/4 cup batter for each pancake onto the prepared griddle, and cook, turning once, until golden brown on both sides.