Preheat oven to 450 Degrees. Trim the head of cauliflower into appetizer sized bites and set aside. In a bowl stir together milk, flour and garlic powder. Dip each piece of cauliflower into the batter and allow the extra batter to drip off. Place on a greased baking sheet. Spray the tops of the florets with cooking oil. Bake for 18 minutes.
Melt the butter in a saucepan over low heat and add the Frank's hot sauce and stir. Toss cooked cauliflower pieces with the sauce. Put back on cookie sheet and bake for 5 to 7 more minutes in the oven. Remove and serve with a side of Blue Cheese Dressing.
(I guessed on the yield - it really depends on how big your head of cauliflower is).