Preheat oven to 425°F (220°C).
Place sliced bell peppers and red onion on a sheet pan. Drizzle with olive oil and sprinkle with salt, cumin, paprika, and garlic powder. Toss to coat.
Roast in the oven for 20–25 minutes, until vegetables are tender and slightly charred.
Meanwhile, blend soaked cashews, water, garlic, nutritional yeast, chipotle pepper, salt, and lime juice in a blender until smooth and creamy.
Warm the tortillas and spread with chipotle queso. Top with roasted vegetables and black beans.
Garnish with fresh cilantro and a squeeze of lime. Serve warm.