Preheat oven to 400°F and line a large baking sheet with parchment paper.
Pat the chickpeas dry with a paper towel to ensure they get crispy during roasting.
In a large bowl, toss the chickpeas, cubed tempeh, broccoli, and bell peppers with avocado oil, garlic powder, smoked paprika, salt, and pepper.
Spread the mixture in a single layer on the baking sheet.
Roast for 20-25 minutes, tossing halfway through, until the vegetables are tender and the chickpeas are golden.
In a small ramekin, whisk together the tahini, lemon juice, and nutritional yeast with a splash of water to create a smooth sauce.
Transfer the roasted mixture to a bowl and drizzle with the creamy tahini sauce before serving.