Look's like I picked they before they got ripe. Here's some 1/8 oz. butter molds I turned out of some hard maple. I think they will also work for mints.
They make a pat of butter 1-1/8" x 1/4". A ounce of butter is 2 cubic inches. A 1-1/8" circle is 1 sq. in.
I used a forstner bit to...