Preheat your oven to 400°F (200°C).
Thinly slice the sweet potato into rounds and dice the apple into chunks, keeping the skin on for extra texture and nutrients.
In a small bowl, combine the olive oil, cinnamon, a pinch of salt, and black pepper.
Coat the chicken breast with half of the olive oil and cinnamon mixture, ensuring an even layer. Reserve the remaining mixture for the vegetables.
Place the chicken breast on a baking tray lined with parchment paper. On the same tray, arrange the sweet potato rounds and apple chunks.
Drizzle the reserved olive oil and cinnamon mixture over the sweet potatoes and apples, tossing gently to coat evenly.
Roast in the preheated oven for about 20-25 minutes, or until the chicken is cooked through (internal temperature of 165°F) and the sweet potatoes are tender with a slight crisp on the edges.
Allow the dish to rest for a few minutes before serving, letting the flavors meld beautifully.