In a large bowl, whisk together the all-purpose flour, baking powder, and salt.
Add the maple syrup, oat milk, water, vanilla extract, and vegetable oil.
Stir just until combined. Do not overmix—small lumps are okay.
Heat a non-stick skillet or griddle over medium heat and lightly grease if needed.
Pour about ¼ cup of batter onto the pan for each pancake.
Cook until bubbles form on the surface and the edges look set, then flip and cook the other side until golden brown.
Remove from the pan and repeat with remaining batter. Serve warm.