Preheat oven to 400.
Toss the potatoes and broccolini with olive oil, salt and pepper. Place the potatoes on a baking sheet and roast 15 minutes. After 15 minutes, remove baking sheet from oven, add broccolini to the potatoes and continue to roast another 5-10 minutes, until potatoes are tender.
While vegetables are roasting season chicken cutlets with salt free seasoning, black pepper and lemon zest. Grill chicken until no longer pink in the center. Slice. Set aside.
In a small bowl, whisk together garlic, lemon juice, oil and thyme.
Toss roasted vegetables, sliced red onion and chicken together in a large bowl. Drizzle lemon oil mixture over everything. Toss well to coat. Serve warm or at room temperature.