In a large bowl, mix together the flour, granulated sugar, and baking powder. Mix in the milk, egg, and vanilla extract, until just combined. Then mix in the butter, until just combined.
Turn the heat up on the skillet to medium and spray with cooking spray.
Pour a TBSP of batter onto the skillet, repeat until the skillet is full of silver dollar pancakes. Wait until you see small bubbles appear on the top of the pancake, then flip it. Cook another minute and serve immediately.
Respray the skillet again with cooking spray before cooking more pancakes.