Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper.
Peel and dice the sweet potato into 1/2-inch cubes, then toss them on the baking sheet with half of the olive oil, sea salt, and black pepper.
Roast the sweet potatoes for 20 minutes, or until they are tender and slightly caramelized on the edges.
While the potatoes roast, heat the remaining olive oil in a large cast-iron skillet over medium-high heat.
Add the ground beef to the skillet, breaking it into small crumbles with a wooden spoon until it is fully browned.
Stir in the diced yellow onion and red bell pepper, sautéing for 5 minutes until the vegetables have softened and become fragrant.
Lower the heat to medium and fold in the roasted sweet potatoes, chopped kale, garlic powder, and smoked paprika.
Continue to cook for 3 minutes, stirring frequently, until the kale is wilted and the flavors are fully incorporated.