Blend the oats until they become a fine oat flour.
In a bowl, whisk Greek yogurt, eggs, maple syrup and vanilla until smooth.
In a separate bowl, mix oat flour, baking powder, baking soda, cinnamon and salt.
Add dry ingredients to wet and gently fold until just combined. Stir in milk. Add a splash more if batter feels too thick. Do not overmix or pancakes can turn flat.
Let batter rest 5 minutes so oats absorb liquid.
Heat a pan over medium and lightly spray with oil. Pour about 1/4 cup batter per pancake.
Cook until edges set, about 2–3 minutes. Flip and cook another 1–2 minutes until golden.