1. Preheat oven to 375 degrees. 2. Cut Cauliflower into large Florets and cook in boiling water for 5 minutes. 3. Using a slotted spoon, remove cauliflower from water. Drain and put on paper towel to dry and cool. 4. While Cauliflower is cooking, melt butter in medium sized saucepan and add diced onions. Stir frequently until onions are soft, about 5 minutes. 5. Toss in minced garlic and let cook for about 1 minute. 6. Add flour and stir to combine, let this mixture cook for about 3 minutes. 7. Stir in the milk and continue to stir frequently until mixture starts to thicken. 8. Remove from heat and add all the cheese, salt, pepper and nutmeg. Stir until fully melted. 9. Coat 9X9 baking dish with butter. Add half of the cauliflower in the bottom. Pour half the cheese mixture on top. Add the other half of cauliflower and then rest of cheese. 10. Bake for 25-30 minutes. Top should start to get golden and cheese should be bubbling. Garnish with Parsley.