2. Peel the eggs. If you want fewer yolks in the salad (optional), halve each egg lengthwise and remove the yolks from up to 4 eggs and discard them; you may keep all yolks if you prefer. Chop the remaining egg whites and any kept yolks to your desired chunk size. (If using an egg slicer, slice once vertically and once horizontally; if not, chop by hand rather than using a food processor.)
3. While the eggs cool or after peeling, combine the dressing and mix-ins in a large bowl: ½ cup 0% fat plain Greek yogurt minus 2 tablespoons (6 tablespoons total), 2 tablespoons fat-free mayonnaise, 2 teaspoons Dijon mustard, a heaping 1/4 cup diced celery, a heaping 1/4 cup thinly sliced green onions (about 1 green onion), 2 teaspoons fresh or dried dill, 1 teaspoon salt, 3/4 teaspoon pepper, a pinch garlic powder, and a pinch sugar (optional). Stir until evenly combined. (Regular yogurt is not recommended because it is too thin.)