Preheat the oven to 425°F. Line a large baking sheet with parchment paper.
Place the cubed sweet potatoes in a large mixing bowl. Add 2 teaspoons olive oil, 1 teaspoon chili powder, ½ teaspoon cumin, ½ teaspoon smoked paprika, ¼ teaspoon garlic powder, ¼ teaspoon salt, and black pepper. Toss to coat.
Spread the seasoned sweet potatoes in a single layer on the prepared baking sheet.
Roast for 25 to 30 minutes, stirring halfway through, until tender and lightly browned.
Heat 2 teaspoons olive oil in a medium skillet over medium heat. Add the onion and cook for 3 to 4 minutes, stirring occasionally, until softened.
Add the minced garlic and cook for 30 seconds, stirring frequently.
Add the black beans, corn, remaining chili powder, cumin, smoked paprika, salt, and 2 tablespoons water. Cook for 5 to 6 minutes, stirring occasionally, until heated through.
Remove the skillet from the heat and stir in 1 tablespoon lime juice.
In a small bowl, whisk together the Greek yogurt, 2 tablespoons lime juice, 1 tablespoon water, garlic powder, cumin, and salt until smooth.
Divide the cooked quinoa, roasted sweet potatoes, black bean mixture, romaine lettuce, and cherry tomatoes evenly among 4 serving bowls.
Sprinkle each bowl with shredded cheese, green onions, and cilantro.
Drizzle the lime yogurt sauce over each bowl and serve.
Notes
Tips and Tricks
Dry the Sweet Potatoes - Pat the cubed sweet potatoes dry before seasoning if they have excess moisture. This helps them brown instead of steam.Use Cooked Quinoa - Prepare the quinoa ahead of time or use refrigerated precooked quinoa to save time.Adjust the Spice - The seasoning is fairly mild. Add a pinch of cayenne pepper or a little hot sauce if you prefer more heat.Keep the Sauce Thick - Greek yogurt varies in consistency. If the sauce is too thick to drizzle, stir in a little additional water.
Storing and Reheating
Refrigerator - Store the cooked sweet potatoes, black bean mixture, and quinoa in airtight containers in the refrigerator for up to 4 days. Keep the lettuce, tomatoes, cheese, and yogurt sauce in separate containers.Freezer - Freeze the cooked sweet potatoes, black beans, and quinoa in freezer-safe containers for up to 2 months for best quality. Freeze without the fresh vegetables, cheese, or yogurt sauce.Microwave - Place the sweet potatoes, black beans, and quinoa in a microwave-safe bowl. Cover loosely and heat in 30 to 60-second intervals, stirring between intervals, until hot throughout. Add the fresh toppings and sauce after reheating.Oven - Reheat the sweet potatoes on a baking sheet at 375°F for approximately 10 to 15 minutes, or until heated through. Warm the beans and quinoa separately.Yogurt Sauce - Refrigerate the sauce in an airtight container for up to 3 to 4 days. Stir before serving. Do not heat the sauce.