Halve eggs, being careful to not destroy whites. Mix yolks, Miracle Whip, onion salt, and mustard. Add butter. Fill eggs with yolk mixture and dust with paprika.
Peel eggs, mash. Add seasonings. Stir in Miracle Whip gradually until it is the desired consistency. Chill.
*To hard boil eggs:
Place eggs in a pot, cover with cold water to 1 inch above eggs. Add 1 tbsp vinegar. Bring to boil, then remove from heat. Cover with tight-fitting lid for 11 minutes, then run under cold water to stop cooking and to cool the eggs. Eggs are easier to peel if left to warm to room temperature.