Today my 2 grandchildren and I had a grilled cheese sandwich. We opened a new package of Kraft Singles American, in the twin pack. I am an avid grilled cheese consumer.and only use Kraft singles. Today the cheese was horrible, both in the sandwiches and in a piece of plain cheese I tasted to see if it was the cheese, it was. There were two problems first it tasted like cheese colored cardboard; the second problem was they did not melt correctly to be creamy and smooth. If you changed your formula please change it back. It has an expiration date of 11 Mar 21 followed by S 73 15:55. Please let me know since if this is your new formula, I will never buy it again. User's recommendation: Don't buy this.