Clean the chicken breasts, season with salt and pepper, then spread BBQ sauce on both sides. Let it marinate for 15 minutes.
Heat a grill pan over medium heat and cook the chicken breasts for 6-7 minutes on each side, until cooked through and slightly caramelized.
Meanwhile, prepare the potato salad: peel the potatoes, cut them into smaller pieces, and boil them in salted water until tender, about 15 minutes.
Drain the cooked potatoes and let them cool. In the meantime, finely chop the red onion, cucumber, and parsley.
In a bowl, combine the sour cream, mustard, one tablespoon of olive oil, salt, and pepper. Add the cooked potatoes, onion, cucumber, and parsley, then gently toss to combine.
To serve, place the BBQ chicken breast on a plate, alongside the potato salad. Garnish with fresh parsley.
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