Caramel Chocolate Shortbread

1/2 c salted butter
2 c flour
1/2 c brown sugar

3/4 c salted butter
1/2 c brown sugar
3 T light corn syrup
1 can sweetened condensed milk

1 1/4 c chocolate chips

Pulse first three ingredients in a food processor until the butter is fully worked into the flour. Dump out into a 9x13 pan and press firmly and evenly into the pan. Bake at 350 degrees for 20-25 minutes, or until light golden brown. Meanwhile, mix the next four ingredients in a 3 qt sauce pan. Stir over medium heat until the butter is melted and the candy is smooth. Turn the heat down a notch or so and continuously stir until the candy comes to a full rolling boil. Boil while stirring for 6-8 minutes, until the caramel is very thick. Pour out onto the baked shortbread layer. Let cool for 5-10 minutes and then cool in the refrigerator until the caramel is firm. Melt the chocolate chips and spread over the caramel layer. Refrigerate again until the chocolate is firm. Let rest at room temperature for another hour before cutting. Cut into 48 squares. Serve