Preheat oven to 425℉. Arrange cauliflower florets on baking sheet. Drizzle with 1 tbsp olive oil and sprinkle a pinch of salt, black pepper and cayenne pepper over cauliflower. Roast for 25 minutes, toss halfway through roasting time.
Meanwhile, when cauliflower is about half done heat 1 tbsp olive oil in a pot over medium heat. Add onion and cook until softened, about 6-8 minutes. Add garlic and stir in.
Add roasted cauliflower (set aside a few florets for garnishing if desired!) to pot along with the vegetable broth. Bring to a boil and then reduce heat to a simmer. Continue simmering for 20 minutes, stirring occasionally.
In 2-3 separate batches, transfer mixture to blender. Add butter and lemon juice. Blend each batch until smooth and then return to pot. Add 1/4 teaspoon kosher salt, Creole seasoning and cook about 3-5 minutes more.
Serve in bowls with reserved cauliflower florets, french fried onions, and fresh chopped parsley. Enjoy!!!