01 - Preheat oven to 425°F. Line a large baking sheet with parchment paper.
02 - In a large mixing bowl, toss the cauliflower florets with 2 tbsp olive oil, 1 tbsp lemon juice, minced garlic, dried oregano, ground cumin, salt, and black pepper until evenly coated.
03 - Spread the seasoned cauliflower in a single layer on the prepared baking sheet. Roast for 25 to 30 minutes, turning halfway through, until the edges are golden brown and the florets are tender.
04 - While the cauliflower roasts, combine the cherry tomatoes, diced cucumber, sliced red onion, and Kalamata olives in a bowl. Drizzle with the remaining 1 tbsp olive oil and 1 tbsp lemon juice, then toss gently to combine.
05 - Divide the roasted cauliflower evenly among 4 serving bowls. Top each portion with the fresh vegetable mixture.
06 - Sprinkle crumbled feta cheese and chopped parsley over each bowl. Add a dollop of hummus if desired, and serve immediately with lemon wedges on the side.