In a bowl, gently mix the eggs, mayonnaise, onion flakes, salt, mustard powder, garlic powder, pepper, and dill. Cover, and refrigerate 8 hours, or overnight. To serve, spread equal amounts on 4 slices bread; top with remaining bread slices to make sandwiches.
If using promptly, begin by placing onion flakes in a small bowl and adding 1/4 cup hot water. Let sit 10 minutes, or until soft. Drain and discard the water, then add the rest of the ingredients to the onion, blending well.
Source: Read Full Article