Preheat your oven to 425°F (220°C) and line the baking sheet with parchment paper. Lightly grease the paper with cooking spray or melted butter.
In a large mixing bowl, whisk together the flour, sugar, baking powder, and salt until well combined.
In a separate bowl, beat the eggs, then add the milk, melted butter, and vanilla extract, whisking until smooth.
Pour the wet ingredients into the dry ingredients and gently stir with a rubber spatula until just combined. Be careful not to overmix; some lumps are okay.
Pour the pancake batter onto the prepared sheet pan, spreading it out evenly with the spatula.
Bake in the preheated oven for 15-20 minutes, or until the pancakes are puffed up and lightly golden. A toothpick should come out clean when inserted in the center.
Remove the sheet pan from the oven and let it cool for a few minutes. Use a sharp knife to cut the pancake into squares.
Serve warm with your favorite toppings such as maple syrup, fresh fruit, or whipped cream.