In a large skillet over medium-high heat, add the olive oil and ground beef, breaking it apart with a spatula until browned and cooked through.
Season the beef with chili powder, cumin, garlic powder, sea salt, and black pepper, then remove from the pan and set aside.
In the same skillet, add the cauliflower rice, corn kernels, and diced red onion, sautéing for 5-7 minutes until the vegetables are tender and slightly charred.
While the vegetables cook, whisk together the Greek yogurt and lime juice in a small bowl to create a smooth, tangy crema.
Divide the cauliflower rice and corn mixture into bowls, top with the seasoned beef, and garnish with crumbled feta and fresh cilantro.
Drizzle the lime crema over the top before serving.