Combine all steak ingredients in a bowl or bag and marinate for at least 20 minutes.
Heat a skillet or grill pan over high heat and cook steak 4–6 minutes per side, depending on doneness.
Remove steak and rest for 5–7 minutes, then slice thinly against the grain.
Warm cooked rice and stir in butter, salt, pepper, garlic powder, lime juice, and cilantro.
Toss zucchini, bell peppers, and onion with olive oil, salt, and pepper.
Roast vegetables at 425°F (220°C) for 15–18 minutes until tender and lightly charred.
Whisk together all sauce ingredients until smooth.
Assemble bowls with rice, roasted vegetables, sliced steak, and fresh toppings.
Drizzle sauce over the top and serve with lime wedges.