Here is what I came up with as a conversion/scale-down of the recipe:

3/4 lb butter (melted) = 1 1/2 cups
1/2 lb flour = 1 1/2 cups
1/2 lb sugar and brown sugar (equal parts) = little over 1/2 cup sugar, little over 3/4 cup brown sugar

It appears to me that it comes out to about 1 1/2 cups of each in scale. I plan to try it out tonight. I'll post how it turns out.