Preheat your oven to 350 degrees Fahrenheit.
Spray a large sheet pan with baking spray and line it with parchment paper. Be sure the sheet pan has sides so the pancake batter will be contained.
In a large bowl, whisk together the flour, sugar, baking powder, baking soda, and salt. Set aside.
To a separate bowl or a large liquid measuring cup, add the melted butter, buttermilk, eggs, and vanilla. Whisk well to combine.
Combine the dry ingredients and the wet ingredients and mix well with a silicone spatula, scraping down the sides of the bowl well to make sure everything is mixed together.
Pour the batter into the prepared sheet pan and add the blueberries or any other toppings you like. Bake for about 15-20 minutes or until the top is golden brown.
Let the pancake sit for about 3-4 minutes before slicing into 12 large slices. Serve with fresh fruit, maple syrup, or your favourite pancake toppings.