Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper for easy cleanup.
Peel and cube the sweet potato into half-inch pieces, then drain and rinse the chickpeas, patting them very dry with a towel.
In a large mixing bowl, toss the sweet potato cubes and chickpeas with olive oil, sea salt, smoked paprika, and garlic powder until evenly coated.
Spread the mixture in a single layer on the baking sheet and roast for 25 to 30 minutes, tossing halfway through, until the potatoes are tender and the chickpeas are crunchy.
While the vegetables roast, whisk together the Greek yogurt, lemon juice, and black pepper in a small bowl to create a smooth, zesty dressing.
Place the fresh baby spinach in a serving bowl, top with the warm roasted sweet potato and chickpea mixture, and finish with a generous drizzle of the yogurt sauce and a sprinkle of hemp seeds.