Preheat your oven to 425°F (220°C) and grease a large sheet pan.
In a large mixing bowl, whisk together the flour, sugar, baking powder, and salt.
In another bowl, mix the milk, eggs, melted butter, and vanilla extract until well combined.
Pour the wet ingredients into the dry ingredients and stir until just combined.
Gently fold in the blueberries if using.
Spread the batter evenly onto the prepared sheet pan.
Bake in the preheated oven for 15-20 minutes, or until golden brown.
Remove from the oven and let cool for a few minutes.
Cut into squares and serve warm with maple syrup and your favorite toppings.
Enjoy your delicious sheet pan pancakes topped with fruit and whipped cream!