In a large bowl, sift together the flour, baking powder, salt, and sugar, ensuring all dry ingredients are well combined.

Gradually whisk in the melted butter, followed by the egg and milk, stirring until the mixture forms a smooth batter. Allow the batter to rest for about 5 minutes to ensure a fluffier texture.

Heat a large skillet over medium-high heat, and coat lightly with cooking spray.

Pour approximately 1/4 cup of batter into the heated skillet for each pancake. Let the pancakes cook for 2 to 3 minutes, or until bubbles form on the surface and around the edges.

Flip the pancakes and continue cooking for an additional 1 to 2 minutes, until golden brown and cooked through.

Repeat the process with the remaining batter. This recipe yields approximately 12 pancakes.