Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
Prick the sweet potato several times with a fork, rub with 0.25 tbsp of olive oil, and bake for 40-50 minutes until tender.
While the potato bakes, whisk together the remaining olive oil, lime juice, chili powder, cumin, salt, and pepper in a small bowl.
Brush the spice mixture over the salmon fillet and let it marinate for 10 minutes.
During the last 12-15 minutes of the sweet potato's cooking time, add the salmon to the baking sheet.
Roast until the salmon is opaque and flakes easily with a fork.
Slice the sweet potato open, fluff the inside with a fork, and top with the flaked salmon.
Finish with a dollop of Greek yogurt and a sprinkle of fresh cilantro.