Preheat oven to 425°F (220°C). Grease a 13x18 inch rimmed baking sheet with butter or cooking spray.
In a large bowl, whisk together flour, sugar, baking powder, and salt.
In a separate medium bowl, whisk together eggs, milk, melted butter, and vanilla extract.
Pour the wet ingredients into the dry ingredients and whisk until just combined. Do not overmix; a few lumps are okay.
Pour the batter onto the prepared baking sheet and spread evenly.
Bake for 12-15 minutes, or until the edges are golden brown and a toothpick inserted into the center comes out clean.
Cut into squares and serve immediately with your favorite toppings.
Notes
This recipe is easily customizable with your favorite mix-ins like blueberries, chocolate chips, or nuts. For a fluffier pancake, ensure your baking powder is fresh.