Preheat your oven to 400°F.
Peel and dice the sweet potato into cubes, toss with olive oil, salt, and pepper, then spread on a baking sheet. Roast in the oven for about 20-25 minutes until tender and lightly browned.
While the sweet potatoes roast, season the chicken breast with salt, pepper, and a portion of the mixed herbs.
Heat a non-stick pan over medium heat and cook the chicken breast for approximately 5-7 minutes per side, or until the internal temperature reaches 165°F.
In a small bowl, combine the low-fat Greek yogurt, minced garlic, and remaining herbs to create a creamy herb sauce.
In another pan, lightly sauté the fresh spinach over medium heat for 2-3 minutes until it wilts to a silky consistency. For extra flavor, season with a pinch of salt.
Plate the chicken, drizzle the creamy garlic herb sauce over the top, and serve alongside the silky spinach and roasted sweet potatoes.