Granulated Sugar (Best Option)
1 teaspoon per 1 tablespoon powdered sugarGranulated sugar works because it is chemically similar to powdered sugar minus the cornstarch and fine grind. When mixed into the egg mixture, it dissolves during cooking, providing sweetness without adding moisture or altering the structure.
To ensure even sweetness, whisk the granulated sugar thoroughly into the eggs before cooking. Slight graininess may remain if not fully dissolved but is generally imperceptible in a cooked omelette.
Compared to powdered sugar, granulated sugar results in a slightly less smooth texture but maintains the intended sweetness and does not compromise the omelette's fluffiness or cooking properties.