Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper for easy cleanup.
Peel the sweet potato and dice it into uniform 1/2-inch cubes, then cut the chicken breast into similar bite-sized pieces.
In a small mixing bowl, whisk together the extra virgin olive oil, honey, garlic powder, sea salt, and black pepper until well combined.
Place the chicken and sweet potato cubes in a large bowl, pour the honey mixture over them, and toss thoroughly to ensure every piece is coated.
Spread the mixture in a single layer on the prepared baking sheet, ensuring there is space between pieces so they roast rather than steam.
Roast for 20 to 25 minutes, tossing halfway through, until the sweet potatoes are fork-tender and the chicken is golden and cooked through.
While the tray is roasting, place the baby spinach in a serving bowl and lightly drizzle with apple cider vinegar.
Remove the tray from the oven and pile the warm roasted chicken and sweet potatoes directly onto the spinach so it wilts slightly before serving.