Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper for easy cleanup.
Dice the sweet potato into half-inch cubes and break the broccoli into bite-sized florets.
Place the chicken breast, sweet potato cubes, and broccoli florets on the baking sheet, then drizzle with one teaspoon of olive oil and season with sea salt, black pepper, and dried oregano.
Roast for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender and slightly caramelized.
While the chicken and vegetables roast, whisk together the remaining teaspoon of olive oil and the balsamic vinegar in a small jar or bowl to create the dressing.
Arrange the fresh mixed greens in a large serving bowl and top with the warm roasted chicken and vegetables.
Finish by crumbling the creamy goat cheese over the salad and drizzling with the prepared balsamic dressing before serving.