Preheat your oven to 400°F and line a large baking sheet with parchment paper for easy cleanup.
Peel the sweet potato and acorn squash, then dice them into uniform 1-inch cubes to ensure even roasting.
In a large mixing bowl, combine the chicken thighs, cubed sweet potato, and acorn squash.
Drizzle with 0.75 tablespoons of extra virgin olive oil and sprinkle with sea salt, black pepper, garlic powder, and smoked paprika, then toss until well-coated.
Arrange the chicken and vegetables in a single layer on the prepared baking sheet, ensuring they are not crowded so they roast rather than steam.
Roast for 25-30 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are golden and tender.
While the chicken rests, heat the remaining 0.25 tablespoons of olive oil in a skillet over medium heat and sauté the spinach for 1-2 minutes until just wilted.
Plate the roasted chicken and vegetables over the warm bed of spinach and serve immediately.