Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Dice the chicken breast, butternut squash, and sweet potato into uniform 1-inch cubes to ensure even cooking.
Place the chicken and vegetables on the prepared baking sheet, then drizzle with olive oil.
Sprinkle the sea salt, black pepper, garlic powder, and dried thyme over the mixture and toss thoroughly to coat.
Spread the ingredients into a single layer and roast in the oven for 20 minutes.
While roasting, remove the stems from the kale and tear the leaves into bite-sized pieces.
Remove the baking sheet from the oven, add the kale, and toss it with the other ingredients to lightly wilt the greens.
Return the pan to the oven for an additional 5-7 minutes until the chicken is cooked through and the vegetables are golden brown.
Remove from the oven and garnish with fresh pomegranate seeds before serving.