We are a family of six. Two of the six are teenage boys. To stretch my food bill, I buy generic Shells and Cheese. When serving it, I use two boxes, but only use one of the cheese packets. Then the next time that I want to serve mac and cheese with dinner, I boil plain macaroni and use my other cheese packet left over from the last time. One cheese packet is more than enough cheese. I personally love home made mac and cheese, but the kids like the cheese in the Shells and Cheese.
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When cooking macaroni and cheese out of the box, add a couple handfuls of plain elbow noodles to the boiling water. Follow the directions on the box using dry milk and water as a substitute for regular milk.