Preheat your oven to 400°F and line a large baking sheet with parchment paper.
Drain and rinse the chickpeas, then pat them very dry with a clean kitchen towel to ensure they crisp up in the oven.
Chop the cauliflower into small florets, slice the red bell pepper into thin strips, and cut the red onion into wedges.
In a large mixing bowl, combine the chickpeas, cauliflower, bell pepper, and onion.
Sprinkle the smoked paprika, garlic powder, dried oregano, sea salt, and black pepper over the vegetables and toss thoroughly to coat.
Spread the mixture in a single layer on the prepared baking sheet and roast for 25 to 30 minutes, tossing halfway through, until the vegetables are tender and the chickpeas are golden.
While the vegetables roast, whisk together the Greek yogurt, lemon juice, and nutritional yeast in a small bowl until smooth and creamy.
To serve, spread the yogurt mixture into the base of two bowls and top with the hot roasted vegetable and chickpea mixture.