1. 1. Hard-boil the eggs and peel them.

2. 2. Cut the eggs in half lengthwise and remove the yolks.

3. 3. In a bowl, mix the yolks with diced onions, mayonnaise, and yellow mustard until smooth.

4. 4. Spoon the yolk mixture back into the egg whites.

5. 5. Garnish with a sprinkle of paprika or chives, if desired.

6. 6. Serve chilled and enjoy!