Preheat a large skillet on a medium high heat.
In a medium size bowl, whisk together oat flour, gluten free flour, baking powder, salt, and sugar if using.
Add egg, oil, milk and vanilla. Mix until just combined.
Let the mixture for a minute or two to allow the flours to absorb the liquid. If the mixture is too thick, add a small amount of milk, if it's too thin, add a bit more flour. It should have a thick cake batter texture.
Turn down the heat to medium, and add a small amount of butter or oil to the pan.
Scoop out the pancake batter in 1/4-1/3 cup scoops into the hot pan,
Allow pancakes to cook for a few minutes, until slightly dry looking on edges and the bubbles have popped.
Flip pancakes, and allow to cook for 2-3 more minutes before removing from pan.
Top your pancakes with whatever you like and enjoy!