I would not add anything to the casserole to make it any bigger than it already is. Just use it for filling in cabbage rolls, stuffed green bell peppers, served hot over crunchy toasted garlic bread, use it for topping on baked potatoes, put it on a pizza pie crust. Otherwise use it as a side dish if you cannot freeze some for next month.
"I have not failed. I've just found 10,000 ways that won't work." --- Thomas Edison