Mix all ingredients for chicken marinade. Add chicken. Marinade chicken for 1 hour (up to overnight).
Cook chicken: Grill chicken using an indoor grill (7 minutes), or using a BBQ (6 minutes per side), until chicken is cooked.
Preheat oven to 425° F. On a large baking sheet, toss veggies with oil, garlic and season with salt and pepper. Bake until the veggies are roasted, approximately 30 minutes.
Divide rice between 4 serving bowls. Top with chicken, roasted veggies, and avocado. Drizzle dressing over each bowl. Serve immediately.