Preheat oven to 425°F (220°C) and prepare the seasoning mix by combining chili powder, garlic powder, onion powder, oregano, paprika, cumin, seasoned salt, and black pepper in a bowl.
Peel and chop sweet potatoes into bite-sized chunks. Toss with olive oil and about 1 tablespoon plus 2 teaspoons of the seasoning mix. Spread on a sheet pan in a single layer.
Roast sweet potatoes for 15 minutes, then toss and roast for another 15 minutes. Check tenderness; roast for an additional 5 to 10 minutes if needed.
When potatoes are almost done, add black beans and fire-roasted corn to the sheet pan. Sprinkle with remaining seasoning and toss together. Return to oven to warm through.
While roasting, prepare cilantro-lime rice or quinoa: Bring 2 cups of liquid to a boil, stir in butter and rice or quinoa, reduce heat to low, cover, and simmer until cooked, about 15-20 minutes. Stir in lime zest, lime juice, cilantro, and season with salt and pepper.
Mix sauce by combining sour cream, lime zest, lime juice, hot sauce, and leftover spice mix. Whisk until smooth, adjusting spice levels to taste.
To assemble bowls, start with a base of rice or quinoa. Top with warm sweet potato mixture, avocado, and any additional toppings. Drizzle with sauce or serve on the side. Squeeze fresh lime over the top before serving.
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Notes
Store leftovers in airtight containers in the fridge for up to 4 days. Reheat roasted veggies and beans before serving.