Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper.
Cut the tempeh into half-inch cubes and chop the broccoli and bell pepper into bite-sized pieces.
In a large mixing bowl, combine the cubed tempeh, rinsed chickpeas, broccoli florets, and chopped bell pepper.
Drizzle the avocado oil over the mixture and sprinkle with sea salt, black pepper, garlic powder, and smoked paprika.
Toss everything together until the ingredients are evenly coated with the oil and spices.
Spread the mixture in a single layer across the prepared baking sheet to ensure even roasting.
Roast for 20 to 25 minutes, tossing halfway through, until the tempeh is golden brown and the vegetables are tender.
Remove the tray from the oven and immediately sprinkle the nutritional yeast over the hot ingredients.
Drizzle with fresh lemon juice and toss once more before serving in a shallow bowl.