Preheat oven to 425 degrees F.
Boil cauliflower for 8-10 minutes or until fork tender; drain.
In a large bowl, combine mayonnaise, sour cream, half of the bacon, 3 tablespoons green onions, 1/2 cup colby cheese, 1/2 cup cheese cheese, House Seasoning blend and cauliflower.
Pour into 13x9 baking dish and top with remaining bacon, green onions and cheeses.
Bake for 15-20 minutes or until cheese melts.