How to Make It
Preheat grill to medium (350°F to 400°F). Toss together sweet potatoes and 1 1/2 tablespoons of the oil in a microwavable bowl. Cover with plastic wrap; microwave on HIGH until tender when pierced with a knife, about 8 minutes, tossing and re-covering after 4 minutes. Let cool 15 minutes.
Add chili powder, salt, pepper, and remaining 1 tablespoon oil to sweet potatoes; toss to coat.
Place sweet potatoes, cut side down, on oiled grates; grill, uncovered, until charred and tender, 2 to 3 minutes per cut side. Remove from grill. Drizzle evenly with honey; sprinkle with queso fresco and chives.