Gold Mountain Cauliflower

1 medium cauliflower
1/2 cup mayonnaise
1-2 tsp. mustard, preferably stone ground
or with horseradish
1 cup grated cheddar cheese

Remove core from cauliflower, place in greased pie pan, cover with plastic wrap. Microwave on high for about 7 minutes, until just fork tender. Combine mayonnaise and mustard. Remove plastic wrap from cauliflower, spread on mayo mix, sprinkle with cheddar cheese. Return to microwave, cook for 1-2 more minutes, or until cheese is melted.