Preheat oven to 375 degrees F.
Prepare Cauliflower: Cut away the leaves and most of the core (cut stem flush with the bottom of the head to allow it to site steadily), leaving the cauliflower intact.
Cooking Whole Cauliflower: Place the whole head of cauliflower into a steamer basket, place the basket in a large pot, and add one inch of water. Cover and bring to a boil over medium heat; steam for 5 to 8 minutes and just until tender and you can pierce it with a fork. Remove from heat and transfer cauliflower to a shallow baking dish.
Spread or frost the top of the steamed cauliflower with Dijon mustard. Sprinkle cheddar cheese over the mustard. Place in oven and bake just until cheese is melted, approximately 10 minutes. Remove from oven.
Serving: Sprinkle optional chopped egg and parsley over the top of the melted cheese and serve immediately.
* Your may substitute a combination of different types of cheeses of your choice.
Steamed Cauliflower Cheese Recipe: https://whatscookingamerica.net/vegetables/steamedwholecauliflower.htm