Plug in your waffle maker and preheat according to the manufacturer's instructions.
In a large mixing bowl, whisk together the eggs, melted butter, low-fat milk, and Greek yogurt until smooth.
In another bowl, combine the self-rising flour, garlic powder, onion powder, and smoked paprika. Stir until well mixed.
Gradually add the dry ingredients to the wet ingredients, stirring until just combined.
Fold in the chopped green onions, shredded cheddar cheese, and grated Parmesan cheese.
Pour the batter onto the greased waffle plates and cook according to the manufacturer's instructions, typically about 4-5 minutes.
Carefully remove the waffles and serve immediately.
