Mix flour, sugar, baking powder and salt together in a mixing bowl with a whisk.
In another mixing bowl, beat the egg and mix in milk and vanilla extract until well combined.
Pour the wet ingredients into the dry ingredients and whisk in a "Z" or "N" motion to prevent developing gluten. Only whisk in circular pattern a few times to incorporate the flour on the edge. Do not overmix! Batter can still contain small lumps.
Pour in melted butter, mix few more times to incorporate.
Turn on the electric grill (I set it my Cuisinart griddler to 400 F) or preheat a nonstick pan to medium low.
Pour 1 tablespoon batter at a time, aim for the same spot and let the batter spread to form a circle. If the batter doesn't spread well, add a bit more milk.
Cook one side until the bubbles pop, then flip and cook for another minute or until it's done.