Preheat your oven to 425°F (220°C). Now, prepare the Cauliflower: Trim the leaves and stem of the cauliflower, leaving the core intact. Slice the cauliflower vertically into 1-inch thick "steaks." You should get about 2 steaks from one large head of cauliflower. Reserve any florets that fall away for another use.

Prepare the Seasoning: In a small bowl, mix together the olive oil, minced garlic, smoked paprika, cumin, salt, and pepper. Place the cauliflower steaks on a baking sheet lined with parchment paper or a silicone baking mat. Brush both sides of the steaks generously with the seasoned olive oil mixture.

Roast the Cauliflower: Roast the cauliflower in the preheated oven for about 15-20 minutes, or until the cauliflower is tender and golden brown around the edges. Flip the steaks halfway through the cooking time to ensure even browning. Remove the cauliflower steaks from the oven and drizzle each steak with a tablespoon of balsamic vinegar.

Optional Topping: If desired, sprinkle grated Parmesan cheese over the cauliflower steaks while they're still hot. Transfer the cauliflower steaks to serving plates, garnish with chopped fresh parsley, and serve immediately.