Halve the eggs horizontally. Remove the yolks to a medium bowl and place the halved egg whites on a platter or tray.
Mash the yolks with a fork or push them through a fine sieve with the back of a spoon. Stir in the mayo and melted butter, mixing well.
Add the rest of the filling ingredients, mixing thoroughly to combine. Adjust taste to your liking: lemon juice for more brightness, sweetener to mellow and balance flavors, or salt to enhance flavors. Best to let sit overnight for the flavors to mingle. (At this point you can cover the halved egg whites and the filling and refrigerate until needed the next day.)
Fill the egg halves (see post for ideas) and sprinkle with paprika.
Chop the bacon very finely and put in a small bowl. Mince the cilantro and measure 2 tbsp. Place the cilantro in a folded paper towel and squeeze it to remove some of the liquid. This way it won't wilt or release water.
Mix the bacon and cilantro together and sprinkle evenly over each deviled egg. Gently cover and refrigerate or serve.
Makes 12 keto deviled eggs with 0.26 g carbs each.
Notes
Food safety rules caution against leaving deviled eggs out longer than 2 hours. Deviled eggs keep in the refrigerator for up to 3 days.