If you have a vacuum sealer, use that to package it. Otherwise, press out as much air as you can when sealing the freezer bag. You can remove any cans you freeze panera mac and cheese or products which you already have from the basket. Add the onions and reduce the heat to low. You can optionally add 1 or 2 Whole Star Anise which help bring out the sweetness of the onions and imparts a subtle aniseed flavour but remove them once the onions are cooked.
Cook the onions gently and slowly until they turn a golden brown colour. Add to saucepan and stir in well and fry for a couple of minutes.
When I was pregnant with my son, there were only two foods that I could stomach: bagels and Panera's Mac & Cheese. I would have their mac & cheese weekly. A viral video showing how Panera's mac and cheese is made sparked making mac and cheese by dunking a plastic bag filled with frozen cheese Read more: Everything Panera Bread employees want to tell you but can't. Apparently, this is how Panera Bread prepares the mac and cheese. Then again, this isn't so different from freezing servings of soup at home and If you didn't know that “fast food” generally means a lot of prepackaged.