Whisk together the flour, sugar, baking powder, and salt in a large bowl until well blended.

In a separate bowl, combine the milk, egg, melted butter, and vanilla extract, whisking until smooth.

Gently pour the wet ingredients into the dry mix and stir slowly until just combined; a few lumps are okay.

Heat a non-stick skillet over medium heat and lightly coat with cooking spray.

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

Watch for bubbles to form on the surface, then flip the pancakes and cook until golden brown on both sides.

Serve warm with your favorite toppings like maple syrup, fresh berries, or whipped cream.