Preheat oven to 400°F and line a baking sheet with parchment paper.
Dice the sweet potato and carrots into small cubes, toss with half the olive oil, sea salt, and black pepper, then roast for 20-25 minutes until tender.
Slice the tempeh into bite-sized cubes and steam for 10 minutes to remove any natural bitterness.
In a small bowl, whisk together the maple syrup, tamari, apple cider vinegar, and garlic powder to create the glaze.
Heat the remaining olive oil in a non-stick skillet over medium heat and sear the steamed tempeh until golden brown on all sides.
Pour the maple-tamari glaze over the tempeh and stir constantly for 2 minutes until the liquid reduces into a thick, sticky coating.
Remove from heat, sprinkle the tempeh with nutritional yeast for a savory boost, and serve alongside the roasted root vegetables.