Preheat oven to 400°.
Spread chopped yams, chickpeas, and red onion over a large oven tray. Drizzle with oil and toss to coat.
Sprinkle with cumin, chipotle powder, salt, and pepper.
Roast for 15 minutes or until golden and cooked through. While roasting, heat a large frying pan over medium heat and sauté kale for 3 to 4 minutes until wilted.
Make the tahini dressing. Whisk all ingredients in a small bowl until smooth. Add a little more water if required.
Divide rice or quinoa between serving bowls and pile on the cooked kale, sweet potato, chickpeas and onion. Top with red clover sprouts, radish slices, and avocado halves. Drizzle tahini dressing on top and sprinkle sesame seeds, if desired.