Hard-boil eggs, then transfer to an ice bath.
Peel and slice in half lengthwise.
Remove the yolks and transfer them to a bowl.
Mash yolks with softened butter, mayonnaise, mustard, vinegar, sugar, salt, and pepper until smooth and creamy.
Spoon or pipe the mixture into the egg whites.
Top with paprika, crispy bacon crumbles, and chives.
Serve chilled.