1. In a mixing bowl, combine flour, baking powder, salt, and sugar.
2. In a separate bowl, whisk together egg, milk, melted butter, and vanilla extract.
3. Gradually add the wet ingredients to the dry ingredients, stirring until just combined.
4. Heat a skillet over medium heat and lightly coat with cooking spray.
5. Pour 1/4 cup of batter onto the skillet for each pancake.
6. Cook until bubbles form on the surface, then flip and cook for another minute or until golden brown.
7. Serve hot with your favorite toppings.