Preheat the oven to 425°F (220°C) and line a baking sheet with parchment paper.
In a mixing bowl, whisk together the flour, garlic powder, paprika, salt, and black pepper. Gradually add water, whisking until a smooth batter forms.
Dip each cauliflower floret into the batter, ensuring it is fully coated, then shake off any excess.
In another bowl, combine the breadcrumbs and grated Parmesan cheese (if using). Coat the batter-covered cauliflower in the breadcrumb mixture, pressing gently so the crumbs stick well.
Place the breaded cauliflower on the prepared baking sheet, ensuring they are not touching.
Lightly spray or drizzle the cauliflower with cooking oil for an extra crispy texture.
Bake in the preheated oven for 20-25 minutes, or until the cauliflower is golden brown and crispy, flipping halfway through.
Once cooked, remove from the oven and allow to cool slightly before serving. Enjoy with your favorite dipping sauce!