The bar that travels, keeps, and disappears first. Doubles cleanly; the Ladies’ Aid will run out regardless.
Heat the oven to 350°. Melt one stick of butter in a 9×13 pan, right in the pan, the way your mother did. Over the butter, in this order and no other: one and a half cups graham crumbs, one cup chocolate chips, one cup butterscotch chips, one cup coconut, one cup chopped nuts if the crowd allows nuts, and over all of it one can of sweetened condensed milk poured slow and even.
Do not stir. Stirring is for people who don’t trust the layers. Bake 25 to 30 minutes, until the edges go gold. Cool all the way — all the way, Eunice means it — before you cut, or you’ll have seven-layer rubble, which still tastes fine but cannot be set on a plate at the potluck. Cut small. They always go.