In a medium-sized mixing bowl, add all your dry ingredients (combine the flour, brown sugar, baking powder, and salt), and whisk until everything is combined.
In a separate medium-sized mixing bowl or liquid measuring cup, add the wet ingredients (oat milk, apple cider vinegar, and vanilla), and whisk until everything is combined.
Add wet ingredients in with the dry ingredients and mix until smooth.
Let batter rest for 5 minutes. 5 Minute Timer
Pour ½ cup (65 grams) of batter onto a griddle (or non-stick pan) over medium heat.
When the top begins to bubble, flip the pancake and cook until golden.