Cook the pasta: Bring a large pot of salted water to a boil.
Cook pasta to al dente according to package directions. Drain and rinse briefly under cool water to stop cooking and prevent clumping.
Prep the chicken: While the pasta cooks, remove skin from the rotisserie chicken. Shred or cube the meat into bite-size pieces.
Aim for a mix of white and dark meat for the best texture.
Make the dressing: In a large bowl, whisk together Greek yogurt, mayo, Dijon, olive oil, lemon juice, red wine vinegar, honey, and garlic. Season with 1/2 teaspoon salt and 1/4 teaspoon black pepper to start. Adjust to taste—add more lemon for brightness or honey for balance.
Chop the veggies: Dice celery, bell pepper, and onion.
Chop the pickles and herbs. Thaw peas under running water and pat dry.
Toss the pasta: Add the cooled pasta to the bowl with dressing. Toss to coat so every piece gets a thin layer.
Fold in the good stuff: Add shredded chicken, celery, bell pepper, onion, peas, pickles, and herbs.
Gently fold until evenly combined. If using cheese, add it now.
Adjust seasoning: Taste and add more salt, pepper, or red pepper flakes. If it feels too thick, splash in a little more lemon juice or a tablespoon of water.
Chill or serve: For the best flavor, cover and chill for at least 30 minutes.
Serve cold or at cool room temperature.