Preheat your oven to 425°F and line a baking sheet with parchment paper. Toss the cubed sweet potatoes with a tablespoon of olive oil, salt, pepper, and paprika until evenly coated. Spread them in a single layer and roast for about 20 to 25 minutes, flipping halfway through until fork-tender and caramelized.
While the potatoes roast, heat the remaining olive oil in a large skillet over medium heat. Add the sausage, breaking it into crumbles as it browns. Toss in the onion and cook everything together until the sausage is fully cooked and the onion turns soft and golden.
Once the sausage is browned, stir in the diced bell pepper and corn kernels. Cook for another 4 to 5 minutes, stirring occasionally, until the peppers soften slightly but still hold a bit of crunch. Season with a pinch more salt and pepper if needed.
While your sausage mixture finishes cooking, reheat your rice in the microwave or on the stovetop with a small splash of water to keep it from drying out. Fluff it with a fork so it's loose and ready to layer into your bowls.
Divide the warm rice evenly among four bowls as your base layer. Top each one with the roasted sweet potatoes and the sausage-vegetable mixture, then sprinkle crumbled feta over the top.
Drizzle each bowl with a little olive oil, a squeeze of fresh lemon juice, and a scattering of chopped fresh herbs. Serve immediately while everything is still warm and the flavors are at their best.