Start by adding the rolled oats to your blender and pulse for about 30 seconds until they become a fine flour – you’ll know it’s ready when you don’t see any whole oat flakes anymore.
Add all your wet ingredients to the blender: milk, eggs, maple syrup, melted butter, and vanilla. Then add your baking powder, cinnamon, and salt.
Blend everything together for about 45-60 seconds until the batter is completely smooth. You might need to stop and scrape down the sides once. The batter should be fairly thin and pourable – about the consistency of heavy cream. Let it rest for 5 minutes while your pan heats up.
Heat a large non-stick skillet or griddle over medium heat. Lightly coat with cooking spray or butter, wiping off any excess with a paper towel.
Pour about 1/4 cup of batter for each pancake. You’ll know it’s time to flip when bubbles form across the surface and the edges start to look dry and set – this usually takes about 2-3 minutes.
Flip and cook the other side for about 1-2 minutes until golden brown. The second side always cooks faster than the first, so keep an eye on it. The pancake should feel springy when you lightly press the center.
If you’re making multiple batches, give the batter a quick stir before pouring each round – it tends to thicken as it sits. You can thin it out with a splash of milk if needed.