Prep the chicken: If using rotisserie chicken, remove skin and bones, then chop or shred the meat. Aim for bite-size pieces so every forkful has a good mix.
Chop the veggies: Dice the cucumber, slice the red onion thin, and halve the cherry tomatoes.
Chop the parsley and dill. Slice the olives if using.
Make the dressing: In a small bowl, whisk together olive oil, lemon zest, lemon juice, Dijon, garlic, oregano, a pinch of salt, and pepper. Taste and adjust acidity or salt as needed.
Toss it together: In a large bowl, combine chicken, cucumber, onion, tomatoes, olives, parsley, and dill.
Pour over the dressing and toss gently to coat.
Add the feta last: Fold in the crumbled feta gently so it stays chunky and doesn’t melt into the dressing.
Chill or serve: You can eat it right away, but it gets even better after 20–30 minutes in the fridge. The flavors meld and the chicken soaks up the dressing.
Finish and plate: Before serving, taste again. Add a pinch of salt, a crack of pepper, or a drizzle of olive oil if it needs it.
Serve over greens, in lettuce cups, or on its own.