Prep: Preheat oven to 375°F (190°C) and lightly oil a deep baking dish. Lay the chopped greens evenly across the bottom of the dish.
Sear Chicken: Season the chicken breasts with salt and black pepper. Heat 1 tablespoon of olive oil in a skillet over medium-high heat and sear the chicken for 2–3 minutes per side until golden. Place the seared chicken into the baking dish on top of the greens.
Glaze: In a small bowl, whisk together the orange juice, honey, balsamic vinegar, Dijon mustard, minced garlic, and the remaining 1 tablespoon of olive oil.
Assemble: Scatter the whole cranberries and mandarin orange segments around and over the chicken. Pour the glaze evenly over the top, then nestle the fresh herb sprigs between the chicken pieces.
Bake: Bake uncovered for 25–30 minutes until the cranberries burst, the glaze reduces, and the thickest part of the chicken reaches an internal temperature of 165°F (74°C).
Finish: Spoon the rich pan juices directly over the chicken breasts and serve hot, garnished with fresh herbs.
