Whisk the oat flour, baking powder, salt, and cinnamon in a large mixing bowl to ensure even distribution of leavening agents.
In a separate medium bowl, combine the eggs, milk, maple syrup, vanilla extract, and melted butter, whisking until homogenous.
Pour the liquid mixture into the dry ingredients and stir with a spatula until just combined; do not overmix.
Allow the batter to rest for 10 minutes at room temperature to allow the oat flour to fully hydrate and thicken.
Heat a non-stick griddle over medium-low heat and lightly coat with oil or butter.
Ladle 1/4 cup portions of batter onto the griddle, ensuring adequate spacing between pancakes.
Cook for 2 to 3 minutes until bubbles form on the surface and the edges appear dry and set.
Flip carefully and cook for an additional 1 to 2 minutes until the second side is golden brown.
Serve immediately while hot.