Preheat your oven to 425°F (220°C).

In a large mixing bowl, combine the flour, sugar, baking powder, baking soda, and salt.

In a medium bowl, whisk together the buttermilk and eggs until well combined.

Pour the buttermilk mixture into the dry ingredients, along with 4 tablespoons of melted butter and vanilla extract. Mix until just combined; do not overmix.

Prepare an 18 by 13-inch sheet pan by brushing it with 2 tablespoons of melted butter.

Pour the pancake batter into the sheet pan and spread it out evenly.

Sprinkle your desired toppings on top—this can include blueberries, strawberries, chocolate chips, or pecans.

Bake in the oven for 15 to 18 minutes or until golden brown.

Once done, brush the remaining melted butter over the surface of the pancake, cut into squares, and serve warm with maple syrup.