Measure and sift the dry ingredients—flour, baking powder, salt, and sugar—into a large mixing bowl, creating a uniform blend. Visual cue: dry ingredients are light and fluffy, with no lumps.
In a separate bowl, whisk together the wet ingredients—milk, beaten egg, and melted butter—until thoroughly combined. Visual cue: mixture is smooth and slightly frothy, with a glossy appearance.
Pour the wet mixture into the bowl with the dry ingredients, then gently fold them together using a spatula or whisk. Mix just until combined; do not overmix. Visual cue: batter is slightly lumpy with streaks of flour, but no dry pockets remain.
Preheat a non-stick skillet or griddle over medium heat, and lightly grease with butter or oil. Visual cue: skillet is hot enough if a few drops of water sizzle and evaporate upon contact.
Pour about ¼ cup of batter onto the hot skillet for each pancake. Cook until bubbles form on the surface and the edges look set, approximately 2-3 minutes. Visual cue: bubbles burst and the edges turn a light golden brown.
Flip the pancakes with a spatula and cook for an additional 2 minutes, until the underside is golden brown and cooked through. Visual cue: surface becomes evenly browned, and pancake has a light, airy appearance.
Transfer the cooked pancakes to a plate and repeat with the remaining batter. Serve warm with toppings of choice, such as syrup, berries, or butter. Visual cue: stacks are fluffy and uniformly golden, ready for presentation.