Preheat the oven to 425°F (220°C). Line a baking sheet with parchment paper.
In a mixing bowl, toss the cubed sweet potatoes with olive oil, ground cumin, smoked paprika, salt, and pepper until evenly coated.
Spread the sweet potatoes onto the prepared baking sheet in a single layer. Bake for 25-30 minutes or until tender and slightly caramelized, stirring halfway through.
While the sweet potatoes are roasting, prepare the quinoa according to package instructions. Set aside.
In a blender or food processor, combine the avocado, lime juice, cilantro, garlic, and water. Blend until smooth and creamy. Adjust the consistency by adding more water if needed. Season with salt and pepper to taste.
In a serving dish or bowl, layer cooked quinoa, black beans, and roasted sweet potatoes. Drizzle with the avocado lime dressing.
Garnish with additional cilantro if desired and serve immediately.