In a large mixing bowl, whisk together the flour, sugar, baking powder, and salt.

In another bowl, combine the milk, egg, melted butter, and vanilla extract.

Pour the wet ingredients into the dry ingredients and stir gently until just combined.

Heat a non-stick skillet or griddle over medium heat and lightly grease it with butter.

Pour about 1/4 cup of batter onto the skillet for each pancake.

Cook until bubbles form on the surface, about 2-3 minutes.

Flip the pancakes when the edges look set and cook for another 1-2 minutes until golden brown.

Transfer the pancakes to a plate and keep warm while you cook the remaining batter.