Preheat oven to 425°F (220°C). Line a baking sheet with parchment paper.
Toss sweet potatoes with olive oil, salt, and pepper. Spread on baking sheet and roast for 30 minutes, flipping halfway through.
While potatoes roast, whisk tahini, garlic, lemon juice, maple syrup, and salt. Gradually add cold water, whisking until creamy and smooth.
Once sweet potatoes are done, let them cool slightly.
In a large bowl, combine roasted sweet potatoes, chickpeas, cranberries, pecans, green onions, and parsley.
Drizzle with tahini dressing and gently toss to coat. Serve warm or at room temperature.