Roll out puff pastry until flattened into a 6" square. Cut into six pieces; cut small slits with the tip of a small knife. Place pastry pieces on 1⁄4 Sheet Pan lined with 1⁄4 Sheet Pan Liner.
In a small bowl, whisk egg. Brush over pastry. Bake until slightly puffed and golden brown, about 15 min. Sprinkle with dip mix once cooked.
Meanwhile, in a bowl, combine seasoning with 2 cups water. Set aside.
Peel and cube potato. Dice carrots and celery. In Multipurpose Steamer combine potatoes, carrots, and celery with 1⁄2 cup water. Cover and microwave on high for 8 min or until veggies are tender.
Meanwhile, heat oil in large sauté pan. Cube chicken. Add chicken to pan; stir-fry until golden and cooked through, about 4–5 min. Finely grate 1 tsp lemon peel.
Stir in reserved seasoning mixture, cooked veggies (including any liquid in the steamer), and lemon peel to pan. Bring a boil, then stir in frozen peas. Cook until warmed through, 1 more min.