When the orzo is ready, add the chicken and any accumulated juices, remaining 3 tablespoons parsley, 3 packed cups baby spinach, and 1 tablespoon of the lemon juice. Cook uncovered, stirring occasionally, until the spinach is wilted and the chicken is cooked through, about 2 minutes. Taste and season with more lemon juice, kosher salt, and black pepper as needed. Garnish with the breadcrumb mixture.
