Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper for easy cleanup.
Peel the sweet potato and cut it into 1-inch cubes; slice the chicken breast into similar bite-sized pieces.
In a small mixing bowl, whisk together the honey, lime juice, olive oil, garlic powder, sea salt, and black pepper until well combined.
Place the chicken and sweet potato cubes on the prepared baking sheet and pour the honey-lime glaze over them, tossing thoroughly to ensure every piece is coated.
Spread the mixture into a single layer, ensuring there is space between the pieces so they roast rather than steam.
Roast in the oven for 20 to 25 minutes, tossing the ingredients halfway through, until the chicken is cooked through and the sweet potatoes are tender with golden edges.
Place the fresh baby spinach in a serving bowl and top with the hot roasted chicken and sweet potato mixture.
Garnish with freshly chopped cilantro and an extra squeeze of lime if desired before serving.