Preheat the griddle. Turn the Blackstone to medium heat and preheat for 8–10 minutes, aiming for about 375°F. A drop of water should dance and sizzle on contact.
Whisk the dry ingredients. In a large bowl, whisk together the flour, baking powder, salt, and sugar until evenly combined.
Add the wet ingredients. Pour in the milk, egg, and melted (slightly cooled) butter. Stir gently just until the dry ingredients are moistened — a few lumps are perfect. Let the batter rest 5 minutes.
Oil the griddle. Drizzle 1–2 tablespoons of vegetable oil onto the hot griddle and spread it into a thin, even sheen with a paper towel.
Pour the pancakes. Using a 1/3-cup measuring cup or ladle, pour rounds of batter onto the griddle, leaving about 2 inches between each one.
Watch for bubbles, then flip. After 2–3 minutes, bubbles will form on the surface and the edges will look set. Flip once and cook 1–2 minutes more, until golden brown.
Serve immediately. Stack with butter, maple syrup, and fresh berries. Hold extra pancakes warm on a sheet pan in a 200°F oven.