01 - Preheat waffle iron according to manufacturer's instructions.
02 - Whisk Greek yogurt, eggs, milk, melted butter, and vanilla in medium bowl until smooth.
03 - Combine flour, sugar, baking powder, baking soda, and salt in separate bowl.
04 - Add dry ingredients to wet ingredients, mixing gently just until incorporated. Do not overmix; small lumps are acceptable.
05 - Lightly grease preheated waffle iron with melted butter or cooking spray.
06 - Pour approximately 1/3 cup batter per waffle and cook until golden brown and crisp, 3-5 minutes per batch.
07 - Serve warm with fresh berries, honey, or maple syrup.