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

In a separate bowl, whisk together milk and egg until fully blended.

Stir in melted butter into the wet mixture until the texture is smooth and glossy.

Pour the wet ingredients into the dry mixture. Gently stir until just combined; some lumps are okay.

Let the pancake batter rest for about 10 minutes.

Heat a nonstick griddle to 350°F.

Pour 1/4 cup of pancake batter onto the heated griddle for each pancake.

Cook until the edges appear set and bubbles form, about 2-3 minutes; flip and cook until golden brown.

Serve your fluffy pancakes hot, stacked high with your favorite toppings.