This is experimental. I do not recommend you trying this recipe. If you do and don't like it, don't come crying back to me.
150g white sugar
1/8 tsp vanilla extract
50g brown sugar
120g flour--1 cup
1 cold egg
Caramelize the white sugar. When dark enough for your taste, add the butter, stirring until it melts.
Mix in the salt, vanilla extract, the brown sugar and then the flour.
Beat in the egg.
Bake at 176C/350F for 21 minutes in an 8 inch square pan.
I think next round, I will add an egg, cut the flour and bake at a lower temperature. That said, I think part of the problem was that I stole the rough proportions from a blondie recipe that is for an 8 inch square pan, not taking into account that by caramelizing the sugar, I'm reducing volume.
I might consider substituting some other sort of flour. Maybe rice flour in place of the wheat flour I'm planning to cut.