Preheat oven to 425 degrees and line a baking sheet with foil or parchment paper.
Place cubed sweet potatoes in a large bowl. In a separate small bowl, whisk together harissa paste, olive oil, and maple syrup. Pour over sweet potato cubes and toss to evenly coat.
In another small bowl, combine garlic powder, paprika, salt, and pepper. Sprinkle over sweet potatoes and toss to coat.
Spread sweet potatoes evenly across baking sheet and roast for 35 minutes, or until cooked through and just slightly crispy on the outside.
While sweet potatoes are roasting, whisk tahini and maple syrup together in a small bowl. When sweet potatoes are done, drizzle tahini maple mixture over the top, or leave on the side for dipping.
Notes
Add a few shakes of cayenne if you want it extra spicy.