Preheat oven to 200 degrees; have a baking sheet or heatproof platter ready. This will be used to keep cooked pancakes warm in the oven
In a small bowl, whisk together flour, sugar, baking powder, and salt. Set aside
In a medium bowl, whisk together milk, butter, and egg
Add dry ingredients to wet; whisk until the dry ingredients are just moistened (it is critical here not to overmix the ingredients. A few small lumps are fine
Heat a skillet or gribble on medium. Fold a sheet of paper towel in half and moisten it with butter or oil. Carefully rub skillet or griddle with oiled paper towel
For each pancake spoon two to three tablespoons of batter onto the skillet or griddle
Cook until bubbles start to form on the surface of the pancake and a few have popped (about 1-2 minutes), then flip. Cook the second side for about 1-2 minutes more
Transfer to a baking sheet; loosely cover with aluminum foil and place in warm oven