Marinate the Chicken: In a bowl or bag, mix avocado oil, lime juice, chipotle chiles, adobo sauce, garlic powder, and salt. Add chicken and toss to coat. Marinate for at least 2 hours or overnight.
Cook the Chicken: Grill or cook in a skillet over medium-high heat for 5–6 minutes per side until fully cooked. Let rest, then slice or chop.
Cook the Rice: Combine rice, water, and salt in a pot. Bring to a boil, reduce heat to low, cover, and simmer for about 15 minutes until tender. Fluff and stir in lime juice, zest, and cilantro.
Assemble the Bowls: Layer romaine and rice in bowls. Top with chicken, black beans, corn, pico, cheese, avocado or guacamole, and Greek yogurt or sour cream.
Serve: Garnish with extra lime wedges and cilantro if desired.