Preheat your oven to 400 degrees Fahrenheit and line a large baking sheet with parchment paper.
Place the cubed sweet potato and trimmed asparagus on the sheet, drizzle with olive oil, and season with half of the salt, pepper, and garlic powder.
Roast the vegetables for 20 to 25 minutes until the sweet potatoes are fork-tender and the asparagus is lightly charred.
While the vegetables roast, heat a large skillet over medium-high heat and add the ground beef, breaking it apart with a spatula.
Season the beef with the remaining salt, pepper, and garlic powder, cooking until browned and fully cooked through.
In a large bowl, combine the shredded romaine, purple cabbage, and diced bell pepper to create the salad base.
Top the fresh greens with the warm roasted vegetables and browned beef, then drizzle with apple cider vinegar before serving.