01 - Preheat the oven to 425°F. Line a large baking sheet with parchment paper.
02 - Remove the leaves and trim the stem of the cauliflower, keeping the core intact. Slice the cauliflower head into 3/4-inch thick rounds.
03 - In a small bowl, combine the olive oil, smoked paprika, cumin, garlic powder, onion powder, cayenne (if using), salt, and pepper. Stir until well blended.
04 - Arrange the cauliflower coins in a single layer on the prepared baking sheet. Brush both sides generously with the spice-oil mixture.
05 - Roast for 20–25 minutes, flipping once halfway through, until the coins are golden and tender with crisp edges.
06 - Transfer to a serving platter. Sprinkle with chopped parsley and serve with lemon wedges, if desired.