Boil the Eggs: Place eggs in a pot, cover with cold water. Bring to a boil, then cover and remove from heat. Let sit for 10–12 minutes. Transfer to an ice bath, peel once cooled.
Dye the Whites (Optional, for red halves): Slice cooked beet into a bowl with 1 cup hot water and a splash of vinegar. Submerge 3 peeled egg whites for 1–2 hours, until deep red. Pat dry.
Prepare the Filling: Slice all eggs in half lengthwise. Scoop yolks into a bowl. Add mayo, mustard, vinegar, turmeric, salt, and pepper. Blend until smooth and creamy. Add chopped onion if desired.
Assemble: Pipe or spoon the yolk mixture back into each egg white half.
Finish with Flair: Sprinkle crushed blue corn chips over each egg. Garnish with microgreens or parsley.