Prepare the Cauliflower

1. Preheat Oven: Preheat your oven to 375°F (190°C). Grease a baking dish with cooking spray or butter.
2. Cook the Cauliflower: In a large pot of salted water, bring to a boil. Add the cauliflower florets and cook for about 5 minutes, or until slightly tender but still firm. Drain and set aside.
3. Toss with Olive Oil: Place the cauliflower in the prepared baking dish and drizzle with olive oil. Season with salt and pepper to taste.

Make the Cheese Sauce

1. Melt the Butter: In a medium saucepan, melt the butter over medium heat.
2. Add the Flour: Whisk in the flour and cook for 1-2 minutes to form a roux (paste).
3. Add Milk: Slowly add the milk while whisking constantly to avoid lumps. Continue whisking until the mixture thickens, about 3-5 minutes.
4. Add Cheese: Reduce the heat and stir in the cheddar cheese and Parmesan until melted and smooth.
5. Season: Stir in the garlic powder, onion powder, and cayenne pepper (if using). Taste and adjust seasoning if necessary.

Assemble the Dish

1. Combine Cauliflower and Sauce: Pour the cheese sauce over the cauliflower, ensuring all florets are covered.
2. Top with Breadcrumbs: If using, mix breadcrumbs with melted butter and sprinkle evenly over the top of the cauliflower and cheese sauce.

Bake the Cauliflower

1. Bake: Place the baking dish in the preheated oven and bake for 20-25 minutes, or until the top is golden and bubbly.
2. Serve: Let cool slightly before serving, and enjoy!