In a bowl, whisk together flour, baking powder, salt, and sugar until combined.

In another bowl, beat the egg and mix in the milk and melted butter.

Gently combine wet ingredients with dry ingredients until just mixed; some lumps are okay.

Preheat a non-stick skillet over medium heat and lightly grease it.

Pour about 1/4 cup of batter onto the skillet for each pancake. Cook until bubbles form on top (about 2 minutes), then flip and cook for another minute until golden brown.

Serve warm with your favorite toppings.