Prep the potatoes: Rinse and cut potatoes into even 1-inch pieces. Keep skins on for extra fiber and texture.
Cook until just tender: Add potatoes to a pot, cover with cold water by 1 inch, and stir in 1 teaspoon kosher salt.
Bring to a gentle boil. Simmer 8–12 minutes, until a knife slides in with slight resistance.
Drain and steam-dry: Drain well. Return potatoes to the hot pot off heat, cover with a clean towel, and let sit 5 minutes to release extra moisture.
Make the lighter dressing: In a large bowl, whisk Greek yogurt, mayonnaise, olive oil, Dijon, lemon juice, vinegar, honey, salt, and pepper.
Taste and adjust acidity and salt.
Add mix-ins: Stir in celery, red onion, pickles or cucumber, capers (if using), dill, and parsley.
Toss while warm: Add warm potatoes to the bowl and gently fold to coat. Warm potatoes absorb flavor better, so don’t wait too long.
Optional eggs: Fold in chopped hard-boiled eggs for extra creaminess and protein.
Chill to meld flavors: Cover and refrigerate at least 30 minutes, ideally 2 hours. Taste again and adjust salt, pepper, or lemon before serving.
Finish and serve: Sprinkle with paprika and extra dill.
Serve slightly chilled or at cool room temperature.