In a mixing bowl, whisk the egg, sugar, and melted butter until slightly frothy.
Add milk and vanilla extract, then fold in flour, baking powder, and salt until smooth; small lumps are okay.
Let the batter rest 5–10 minutes; it will puff slightly as baking powder activates.
Preheat a nonstick skillet over medium heat (325–375°F) and lightly grease with butter or spray.
Preheat a nonstick skillet over medium heat (325–375°F) and lightly grease with butter or spray.
Cook until bubbles appear on the surface and edges look set, about 2–3 minutes.
Flip carefully and cook the second side until golden brown, 1–2 minutes.
Remove from skillet and serve immediately with desired toppings.