Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper.
Peel the sweet potato and cut it into half-inch cubes, then toss them directly on the sheet with olive oil, sea salt, and black pepper.
Roast the sweet potatoes for 20-25 minutes, tossing halfway through, until they are tender and the edges are golden brown.
While the potatoes roast, heat a large non-stick skillet over medium-high heat and add the lean ground beef.
Break the beef into small crumbles with a spatula and season with the chili powder and cumin, cooking until no longer pink.
Add the corn kernels to the skillet with the beef and sauté for 3-5 minutes until the corn is hot and slightly charred.
In a small ramekin, whisk together the Greek yogurt and lime juice until smooth to create a creamy lime drizzle.
Assemble the bowls by layering the roasted sweet potatoes at the bottom, followed by the beef and corn mixture.
Top each bowl with crumbled feta cheese, fresh chopped cilantro, and a generous drizzle of the lime crema before serving.