In a medium-sized mixing bowl, combine flour, sugar, baking powder, and salt. Whisk until well blended.

Add milk and egg to the dry mixture. Gently whisk until just combined, keeping it slightly lumpy.

Pour in melted butter and lightly stir until just incorporated.

Let the batter sit for about 10 minutes.

Preheat a griddle or skillet over medium heat until it reaches 350°F.

Pour 1/4 cup of batter onto the hot surface for each pancake. Cook until bubbles form.

Carefully flip each pancake and cook until golden brown.

Transfer to a warm plate and serve immediately with toppings.