Preheat your waffle iron according to the manufacturer's instructions.

In a large mixing bowl, whisk together the flour, sugar, baking powder, and salt until well combined.

In another mixing bowl, beat the eggs until light and frothy.

Add the milk, melted butter, and vanilla extract to the beaten eggs, and whisk until smooth and well combined.

Pour the wet ingredients into the bowl with the dry ingredients.

Stir until just combined, being careful not to overmix. A few lumps in the batter are okay.

Lightly grease the waffle iron with cooking spray or melted butter.

Pour enough batter onto the center of the preheated waffle iron to cover about 2/3 to 3/4 of the surface (the amount will depend on the size of your waffle iron).

Close the waffle iron and cook according to the manufacturer's instructions, typically for 3-5 minutes, or until the waffles are golden brown and crispy on the outside.

Use a spatula to carefully remove the cooked waffles from the waffle iron and transfer them to a plate.

Serve the waffles immediately while they are hot and crispy.

Serve with your favorite toppings, such as maple syrup, butter, fresh fruit, whipped cream, or chocolate sauce.