Finely chop the yellow onion and green onions. Heat the olive oil in a skillet over medium heat and sauté the yellow onion until golden brown.
Melt the butter over low heat, then let it cool slightly.
In a large bowl, whisk together the flour, baking powder, salt, black pepper, and garlic powder until well combined.
In a separate bowl, whisk the eggs, then add the milk and melted butter. Mix well.
Pour the wet ingredients into the dry ingredients and mix until just combined. Then, stir in the sautéed yellow onion, green onions, and grated cheese.
Preheat your waffle iron and lightly grease it with butter or oil to prevent sticking.
Pour a portion of the batter onto the preheated waffle iron and cook for 3-5 minutes, or until golden brown and crispy.
Repeat the cooking process with the remaining batter. Keep the waffles warm until serving.
Garnish with extra green onions and freshly grated cheese before serving. Serve with sour cream or a savory dipping sauce.
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