Preheat oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper.
In a small mixing bowl, whisk together olive oil, honey, minced garlic, and soy sauce until emulsified.
In a large bowl, combine the sliced sausage and cubed sweet potatoes.
Pour the honey garlic sauce over the sausage and potatoes, seasoning with salt and pepper.
Toss the mixture thoroughly to ensure even coating of all surfaces.
Spread the ingredients onto the prepared baking sheet in a single layer to ensure even roasting.
Bake for 25 minutes, tossing the ingredients halfway through the cooking time, until sweet potatoes are fork-tender and caramelized.
Remove from the oven and garnish with fresh parsley before serving.