Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper for easy cleanup.
Peel and dice the sweet potato into 1/2-inch cubes and cut the chicken breast into bite-sized pieces.
In a large mixing bowl, toss the sweet potato and chicken with the olive oil, sea salt, black pepper, garlic powder, and smoked paprika until thoroughly coated.
Spread the chicken and sweet potato mixture in a single layer on the prepared baking sheet.
Roast for 20-25 minutes, tossing halfway through the cooking time, until the chicken is cooked through and the potatoes are golden and tender.
While the oven does the work, remove the tough center stems from the kale and tear the leaves into small, manageable pieces.
Place the kale in a skillet over medium heat with a splash of water and the lemon juice, sautéing for 3-4 minutes until the leaves are vibrant and tender.
Assemble your harvest bowl by placing the sautéed kale at the base and topping it with the roasted chicken and sweet potato cubes.
Finish the bowl by adding the fresh avocado slices on top and serve immediately.