Preheat your oven to 425°F (220°C). Line your baking sheet with parchment paper for easy cleanup, if desired.
In a large mixing bowl, whisk together the flour, sugar, baking powder, baking soda, and salt until well combined.
In another bowl, whisk the eggs, then add the milk, melted butter, and vanilla extract. Mix until combined.
Pour the wet ingredients into the dry ingredients and stir until just combined. Be careful not to overmix; it's okay if there are a few lumps.
Pour the batter onto the prepared baking sheet, spreading it out evenly.
Optionally, sprinkle your choice of toppings evenly over the batter, such as fresh berries or chocolate chips.
Bake in the preheated oven for 15-20 minutes, or until the edges are golden brown and a toothpick inserted in the center comes out clean.
Remove from the oven and let it cool for a few minutes. Cut into squares and serve warm with maple syrup or your favorite toppings.