Steam the cauliflower until barely done. If you don't have a steamer basket, I would microwave in a covered dish with a small bit of water.

Preheat the oven to 350.

Put the cauliflower into a small buttered baking dish.

Melt the butter in a small saucepan and then stir in the flour. Cook over medium-low heat 2 minutes.

Heat the milk in a microwave during the two minutes if you'd like. It makes it easier to blend.

Slowly whisk the milk into the butter and flour, then bring to a boil. Turn down the heat and simmer a few minutes, stirring, until it has thickened.

Take the pan off the heat and stir in 1/2 cup of cheese.

Pour the cheese sauce over the cauliflower.

Top with a bit more grated cheese if you'd like.

Bake uncovered for 20-25 minutes.