Pre-heat your oven to 400°F and line a large baking sheet with parchment paper for easy cleanup.
Cut the tempeh into 1/2-inch cubes and chop the broccoli and bell peppers into uniform, bite-sized pieces.
In a large mixing bowl, whisk together the extra virgin olive oil, tamari, grated fresh ginger, and garlic powder.
Add the tempeh cubes and vegetables to the bowl, tossing thoroughly until every piece is evenly coated in the marinade.
Spread the mixture in a single layer on the prepared baking sheet, ensuring there is space between pieces so they roast rather than steam.
Bake for 20 to 25 minutes, tossing the ingredients halfway through, until the tempeh is golden-brown and the vegetables are tender.
Remove from the oven and immediately sprinkle with nutritional yeast, sea salt, and black pepper before serving.