Preheat your oven to 400°F and line a large baking sheet with parchment paper.
Press the tofu firmly to remove excess moisture and cut both the tofu and tempeh into 1-inch cubes.
In a large mixing bowl, whisk together the olive oil, tamari, garlic powder, smoked paprika, sea salt, and black pepper.
Add the cubed tempeh, tofu, sweet potatoes, and red bell peppers to the bowl, tossing gently to ensure every piece is evenly coated.
Spread the mixture in a single layer on the prepared baking sheet, ensuring no pieces are overlapping.
Roast for 20 minutes, then briefly remove from the oven to sprinkle the nutritional yeast and hemp seeds over the top.
Toss the mixture with a spatula and roast for another 10 to 15 minutes until the vegetables are tender and the proteins are golden brown.