In a skillet, heat oil over medium heat. Add chopped red onion and sauté for about 5 minutes until translucent and slightly browned. Stir in the vegan chorizo and black beans, seasoning with chipotle seasoning and garlic powder. Cook for 7-10 minutes until heated through and thickened.

In a bowl, whisk together vegan yogurt, lime juice, and a pinch of chipotle seasoning. Gradually add water to achieve a smooth consistency. Adjust seasoning if needed.

In a large bowl, chop romaine lettuce and additional greens. Drizzle dressing over greens and toss gently to coat evenly.

On a serving platter, layer dressed greens, topped with the vegan taco meat mixture, tomatoes, corn, diced avocado, and any additional toppings.

Sprinkle nutritional yeast or hemp seeds over the top. Serve immediately, with remaining dressing on the side.