Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper.
Peel and dice the sweet potato and Yukon gold potato into uniform 1/2-inch cubes.
In a large bowl, toss the potato cubes with the olive oil and half of the sea salt, black pepper, and smoked paprika.
Spread the potatoes in a single layer on the prepared baking sheet and roast for 15 minutes.
While the potatoes are roasting, season the chicken breast evenly with the remaining salt, pepper, paprika, and garlic powder.
Remove the tray from the oven, move the potatoes to one side, and place the chicken breast on the other side.
Return the tray to the oven and roast for another 15 to 20 minutes, or until the chicken reaches an internal temperature of 165°F and the potatoes are tender.
In a small ramekin, whisk together the Greek yogurt and lime juice until the mixture is smooth and pourable.
Slice the chicken into strips and the avocado into thin wedges.
Assemble the bowl by placing the roasted potatoes and chicken at the base, then top with avocado and a generous drizzle of the lime-yogurt sauce.