Preheat oven to 400Trim cauliflower florets from the stalk

Discard stalk

Cut florets into 1-2 ince pieces

Steam the cauliflower for about 10 minutes until firm but tender

Spread the florets out onto a paper towel to dry while making the cheese sauceIn a medium sauce pan, melt the butter over medium high heat, add the flour and whisk to combine

Cook for about 1-2 minutes to get rid of the flour taste

Add the mustard powder, pinch of cayenne, black pepper and stir to combine

Drizzle the milk in a steady stream whisking the whole time so that the mixture stays creamy

Season with salt and bring to a simmer, stirring constantly

When mixture thickens, add the cheese one handful at a time

Taste the sauce and adjust the salt/pepper as needed

Spread the cauliflower florets into a 2 quart baking dish (or iron skillet), spoon the sauce over the top and sprinkle about 2 tbs of cheese over the top

Bake until browned and bubbly about 30 minutes

Garnish with fresh herbs if desired