Preheat oven to 400°F and line a baking sheet with foil.
Toss chickpeas with half the oil and all spices, salt, and sugar in a bowl. Arrange on half of the baking sheet.
Place sweet potato rounds on the other half, drizzle with remaining oil, and sprinkle with salt.
Bake for 20 minutes, then flip sweet potatoes and toss chickpeas. Bake another 10-15 minutes until potatoes are tender and chickpeas are crispy.
Meanwhile, whisk together tahini, lemon juice, and maple syrup. Add hot water until pourable.
Let roasted items cool slightly before assembling.
Divide greens between plates, top with sweet potatoes, chickpeas, and pumpkin seeds.
Serve with dressing on the side.