3 tbsp. mayonnaise
1 tbsp. apple cider vinegar
1 tbsp. melted butter
2 tsp. yellow mustard
2 tsp. sugar
Kosher salt and freshly ground black pepper
1. Put eggs into a small pot; cover with water by 2". Bring to a boil, cover, and remove from heat. Let stand for 8 minutes, drain, and run eggs under cold water to chill. Gently peel eggs and halve each lengthwise. Remove yolk from each egg half and transfer to a large bowl.
2. Arrange whites on a large platter, cover, and refrigerate. Mash yolks well with a fork, then add mayonnaise, vinegar, butter, mustard, sugar, and salt and pepper to taste. Stir the egg yolk mixture until smooth. Using a small spoon, fill each egg white half with a rounded dollop of the egg yolk mixture. Loosely cover deviled eggs with plastic wrap and refrigerate until chilled. When ready to serve, sprinkle the eggs with paprika.