01 - Preheat oven to 400°F. Line a large baking sheet with parchment paper.
02 - In a mixing bowl, whisk together the honey, minced garlic, soy sauce, apple cider vinegar, Dijon mustard, smoked paprika, salt, and pepper until well combined.
03 - Place the chicken breasts on one side of the prepared baking sheet. Arrange the sweet potato cubes and sliced red onion on the opposite side. Drizzle the vegetables with olive oil, season with salt and pepper, and toss to coat evenly.
04 - Spoon half of the honey garlic sauce over the chicken breasts, coating them thoroughly. Set aside the remaining sauce for later use.
05 - Roast in the preheated oven for 25 minutes. Remove from the oven and brush the chicken with the reserved honey garlic sauce. Gently stir the sweet potatoes to ensure even caramelization.
06 - Continue roasting for an additional 10 minutes, or until the chicken reaches an internal temperature of 165°F and the sweet potatoes are tender and caramelized.
07 - Allow the chicken to rest for 5 minutes before slicing. Plate alongside the roasted sweet potatoes and onions, and garnish with freshly chopped parsley.