Preheat your oven to 375º F and prepare a 9x9-inch or 2 quart baking dish with some grease.

Roast your cauliflower florets on a baking sheet for about 20 minutes until they start to get golden.

In a small saucepan, melt 4 tablespoons of butter over low heat. Add the onion and cook until it’s soft, roughly 5 minutes. Then, stir in the flour and cook while stirring constantly for about 3 to 5 minutes until it begins to brown lightly.

Gradually add the hot milk to the flour mixture, whisking to create a smooth sauce. Season with salt and lots of black pepper, cooking until it’s just simmering.

Take the sauce off the heat and mix in half of your shredded cheese until it all melts together beautifully.

Spoon the roasted cauliflower into your greased baking dish and pour the cheesy sauce all over it.

Top with the remaining shredded cheese and sprinkle parmesan on if you’d like.

Melt the remaining 2 tablespoons of butter and combine it with the breadcrumbs and a sprinkle of salt. Sprinkle this mixture over the cauliflower.

Put everything in the oven to bake for about 20 minutes until the cheese is melted and bubbly.

Once done, sprinkle a little more parmesan on top and serve hot. Enjoy this delightful dish for a family dinner or gatherings!