Place the flour and sugar, if using, in a mixing bowl and combine.
Make a well in the centre and add the vanilla, egg and 3/4 of the milk. Combine the ingredients with a whisk and mix to a smooth batter.
Check the consistency of the batter, it should be thick but runny enough to fall off a spoon in a consistent stream but not too drippy. Correct consistency with remaining milk.
Heat a non stick pan and spray with vegetable oil. Drop some batter into the pan to make desired size.
When bubbles appear on the top of the pancakes, flip them over and continue to cook. Pancakes should be light and fluffy. Adjust the heat under the pan so pancakes cook evenly without burning but are still cooked through.