Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper.
Cut the tempeh into 1-inch cubes and slice the red bell pepper into bite-sized pieces.
In a large mixing bowl, whisk together the extra virgin olive oil, lemon juice, dried oregano, garlic powder, sea salt, and black pepper.
Add the tempeh cubes, broccoli florets, and bell pepper pieces to the bowl, tossing well to ensure every piece is thoroughly coated in the marinade.
Spread the mixture in a single, even layer on the prepared baking sheet to ensure even roasting.
Bake for 20 to 25 minutes, tossing the ingredients halfway through, until the vegetables are tender and the tempeh is lightly browned.
Remove from the oven and sprinkle the nutritional yeast over the hot tray before serving.