In a large bowl, whisk flour, sugar, baking powder, baking soda, and salt until well combined. Create well in the center.
Into the well of the dry ingredients, pour in remaining ingredients (milk, melted butter, vanilla extract, and eggs). Whisk to incorporate and create a batter.
If it seems too thick, add in an extra splash of milk. You want your waffle batter to be the consistency of white school glue.
Preheat Belgian waffle maker. Brush generously with melted butter and pour in about ½ cup batter into the center. Close and cook according to waffle maker instructions.
Repeat with remaining batter until all waffles have been cooked. Serve warm with berries, whipped cream, powdered sugar, maple syrup and/or butter.
