Preheat the oven to 400°F (200°C).
In a large bowl, toss the diced sweet potatoes with olive oil, garlic powder, onion powder, paprika, salt, and pepper until evenly coated.
Spread the sweet potatoes in a single layer on a baking sheet and roast in the preheated oven for 20 minutes.
While the sweet potatoes are roasting, prepare the honey garlic sauce. In a small saucepan over medium heat, combine honey, soy sauce, minced garlic, and apple cider vinegar. Stir until well mixed and bring to a simmer. Cook for 2-3 minutes until slightly thickened, then remove from heat.
After 20 minutes, remove the baking sheet from the oven and add the sliced sausage to the sweet potatoes. Toss everything together and return to the oven for an additional 15-20 minutes, or until the sweet potatoes are tender and the sausage is heated through.
Drizzle the honey garlic sauce over the sausage and sweet potatoes, tossing to coat. Garnish with chopped parsley before serving.