Preheat your oven to 425°F (220°C). Line a baking sheet with parchment paper.
In a large bowl, toss the diced sweet potatoes with olive oil, paprika, garlic powder, salt, and pepper until evenly coated. Spread them out in a single layer on the prepared baking sheet.
Roast the sweet potatoes in the preheated oven for 25-30 minutes, or until they are tender and slightly caramelized, stirring halfway through.
While the sweet potatoes are roasting, season the chicken breasts with salt and pepper. Heat a grill pan or skillet over medium-high heat and cook the chicken for about 6-7 minutes per side, or until fully cooked and no longer pink in the center.
Brush the cooked chicken with BBQ sauce and let it cook for an additional 2-3 minutes, allowing the sauce to caramelize slightly. Remove from heat and let it rest for a few minutes before slicing.
In a large bowl, combine the roasted sweet potatoes, corn, and black beans. Toss gently to mix.
To assemble the bowls, divide the sweet potato mixture among serving bowls. Top with sliced BBQ chicken, diced avocado, and chopped cilantro. Serve with lime wedges on the side.