whirl 1 cup butter, the flour and 1/2 cup of brown sugar in a food processor

they will clump up a bit but won't make a "real" dough, that's OK

simply press the crumbles into a 9x13 pan

bake for 20-25 minutes

meanwhile make the caramel filling

in a heavy sauce pan over medium heat cook together: 1/2 cup brown suagr, 3/4 cup butter, the corn syrup and the sweetened codensed milk, cook and stir, always stirring

until it boils

then reduce heat and simmer for 7 minutes, keep stirring don't stop!

remove from heat until cookie base comes out

pour over hot cookie

chill in the fridge until firm

then melt together the chocolate chips and 1 tsp of butter, spread over the cooled base and caramel

sprinkle with sea salt if desired