Mix the flour, sugar, baking soda and salt in a bowl.
Whip eggs in a blender until fluffy.
Add the milk, vanilla, and the butter to the blender. Blend for 1 minute.
Add all the dry ingredients in thirds, blending for two minutes between each addition. Make sure to scrape the sides of the blender to properly mix all ingredients, if necessary.
Preheat a pan to medium heat.
Spray cooking oil onto the pan.
From the blender, pour a small amount of batter onto the pan and tilt the batter around the pan to evenly distribute it.
Cook until golden-brown, then flip and cook the other side until golden brown.
Apply more cooking spray to pan after each pancake is cooked.