I can’t believe there’s no butter

Well, not no butter. But certainly less than you’d expect. Another example of what producers are having to do in the face of ever-rising input costs.
The wrappers are probably long paid for in bulk. The boxes they’re packed into measured for the original dimensions. The size expectations of what a portion of butter looks like set in the minds of people.
“So what if we… worked out how to put only 75% of the butter in there?”