Prep the chicken: Shred or dice the cooked chicken into bite-size pieces. Aim for small, even pieces so the dressing coats every bite.
Make the dressing: In a large bowl, whisk the mayonnaise, Greek yogurt, Dijon, lemon juice, lemon zest (if using), garlic powder, and onion powder until smooth.
Add the aromatics: Stir in the celery, red onion, dill, and parsley.
Mix until evenly distributed.
Combine: Fold the chicken into the dressing until everything is well coated. If the salad looks dry, add 1–2 more tablespoons of mayo.
Season: Taste and add salt and pepper. Start with 1/4 teaspoon salt and a few grinds of pepper, then adjust to your liking.
Optional crunch or tang: Fold in chopped nuts for crunch and richness, or chopped dill pickles for extra tang.
A pinch of smoked paprika adds deli-style depth.
Chill: Cover and refrigerate for at least 30 minutes. This helps the flavors meld and the texture set.
Serve: Spoon into lettuce cups, layer into a low-carb wrap, pile onto keto toast, or serve with cucumber rounds for scooping.