Preheat your oven to 400°F.
Peel and cube the sweet potato into 1-inch pieces.
Toss the sweet potato cubes with half of the olive oil, a pinch of sea salt, and black pepper on a baking sheet.
Roast the sweet potatoes for 20 to 25 minutes until they are tender and slightly caramelized.
Season the sirloin steak on both sides with the remaining sea salt, black pepper, and garlic powder.
Heat the remaining olive oil in a cast-iron skillet over medium-high heat.
Sear the steak for 3 to 4 minutes per side for medium-rare, or until it reaches your desired doneness.
Remove the steak from the skillet and let it rest on a cutting board for 5 minutes before slicing against the grain.
In the same skillet, add the kale and a splash of water, sautéing for 2 minutes until bright green and wilted.
Assemble the bowl by layering the roasted sweet potatoes and sautéed kale, topping with the sliced steak and a drizzle of balsamic glaze.