3. Step
Combine cream cheese, garlic powder, onion powder, oregano, mustard, pepper, salt, cayenne and ¼ cup scallions in a large bowl; beat with an electric mixer on medium speed until smooth, about 1 minute. Fold in the cauliflower, chicken and 1 cup Cheddar. Spoon the mixture into the prepared baking dish. Sprinkle with the remaining ½ cup Cheddar and cover with foil.