So, armed only with childhood memories, we went hunting. And we found this...
1 pkg butterscotch chips
1 pkg (about 2 cups) chocolate chips
1/2 cup peanut butter
1 pkg mini-marshmallows
Line 9x13 pan with tinfoil. Grease tinfoil. In a large bowl microwave together chocolate chips, butterscotch chips and peanut butter in 30s-1min intervals until melted. Add marshmallows. Pour into pan. Refrigerate until solid.
Okay, so we realized why these are brought to potlucks - because one or two is tasty but anymore gets a little much. So I don't know if I'll make them again.