Prepare and Roast Sweet Potatoes: Preheat your oven to 400°F (200°C). Line one or two large baking sheets with parchment paper or lightly oil them to prevent sticking. Using a sharp knife or mandoline slicer, cut the sweet potatoes into even ¼-inch slices, keeping the skin on for extra nutrients and texture. Toss the slices gently in the canola oil until fully coated. Arrange them in a single layer on the baking sheets without overlapping to ensure crispness. Roast in the oven for about 30 minutes, flipping halfway through. Keep a close eye during the last 10 minutes to avoid burning. The sweet potatoes should be tender inside and crispy on the edges.
Mix the Black Bean Salsa: While the sweet potatoes roast, prepare the salsa. In a small bowl, whisk together the lime juice, apple cider vinegar, and agave syrup to create a tangy marinade. In a larger bowl, combine the black beans, diced bell peppers, red onion, jalapeño, corn, and grape tomatoes. Pour the marinade over the vegetables, then sprinkle in the cumin, chili powder, and salt. Toss everything well to combine. Cover and refrigerate to let the flavors meld until serving.
Blend the Spicy Cashew Queso: Drain the soaked cashews and add them to a blender along with the chopped chipotle peppers, adobo sauce, water, lemon juice, nutritional yeast, miso, onion powder, garlic powder, and cornstarch. Blend on high until the mixture becomes silky smooth, which may take 1 to 2 minutes depending on your blender’s power. Pour the blended queso into a small saucepan. Heat over medium-low, stirring occasionally, until warmed through and slightly thickened. Add small amounts of water if you prefer a thinner consistency.
Assemble and Serve: Arrange the roasted sweet potato rounds on a large serving platter or individual plates. Spoon the black bean salsa on top using a slotted spoon to avoid excess liquid. Drizzle the warm cashew queso over everything. Garnish with chopped cilantro, diced avocado, and lime wedges on the side for an extra burst of freshness. Serve immediately and enjoy!