Brown the sausage with the celery, red pepper, onion and mushrooms.
Stir the softened cream cheese into the sausage mixture until well blended.
Coarsely chop the cooked cauliflower.
Mix all of the remaining ingredients in.
Spread in a greased 9x13" baking dish.
Bake at 350º for about 30 minutes.
Remove from oven and top with cheese and place back in oven for 10 minutes to finish cooking.