Preheat your oven to 400°F and line a large baking sheet with parchment paper.
Peel the sweet potato and cut it into 1/2-inch cubes.
Slice the chicken breast into bite-sized pieces.
In a mixing bowl, toss the chicken and sweet potato cubes with olive oil, sea salt, black pepper, garlic powder, and smoked paprika until evenly coated.
Spread the chicken and potatoes in a single layer on the prepared baking sheet.
Roast for 20-25 minutes, or until the chicken is cooked through and the sweet potatoes are tender and lightly browned.
Place the baby spinach in a large serving bowl as your base.
Top the spinach with the roasted chicken and sweet potatoes, then add the fresh avocado slices.
Drizzle the entire bowl with fresh lemon juice and serve immediately.