Place the flour, sugar, baking powder, and salt in a large bowl, and whisk to combine.
Place the buttermilk, melted butter, eggs, and vanilla in smaller bowl, and whisk to combine.
Pour the liquid ingredients into the dry, and fold together until mostly blended but still a little lumpy.
Place about 1 cup of waffle batter into the hot waffle maker and cook until golden brown (about 2 to 3 minutes).
*If you don’t have buttermilk, you can substitute by stirring 3 tablespoons of lemon juice or white vinegar into 3 cups of regular milk. Allow the mixture to stand for 5 minutes, or until thickened and slightly curdled.