While the chicken is cooking, cook the black rice according to the package instructions.
If using roasted vegetables, preheat the oven to 400°F (200°C). Toss the spring vegetables with olive oil, salt, and pepper, and spread them out on a baking sheet. Roast for 15-20 minutes, or until tender and lightly browned. If using steamed vegetables, steam them until tender-crisp.
To assemble the bowls, divide the cooked black rice among serving bowls. Top with the grilled cilantro lime chicken, roasted or steamed spring vegetables, and chopped peanuts.
Garnish the bowls with sliced green onions, fresh cilantro leaves, Thai basil, and lime wedges, if desired.
If using, drizzle the nuoc cham-inspired sauce over the assembled bowls just before serving, or serve it on the side for dipping.
Serve the bowls immediately, with extra lime wedges on the side for squeezing over the top.