Preheat your oven to 400°F.
Wash and scrub the sweet potato, then cut it into bite-sized cubes.
Toss the sweet potato cubes with olive oil, a pinch of salt, pepper, and half of the dried rosemary and thyme.
Spread the sweet potato on a baking sheet and roast in the oven for about 20-25 minutes until tender and lightly browned.
While the sweet potato roasts, heat a non-stick skillet over medium heat.
Add the lean ground beef to the skillet, breaking it apart as it cooks.
Season the beef with garlic powder, the remaining rosemary and thyme, salt, and pepper, and cook until it is browned and cooked through.
Once the beef is nearly done, stir in diced red onion and let it soften slightly, about 2 minutes.
Plate the roasted sweet potato, then top with the herb-seasoned ground beef and red onion mixture.
Finish by adding a handful of fresh baby spinach on top for a burst of color and freshness. Serve warm.