1
: Preheat oven to 350ºF (180ºC).
2
: Pulse all crust ingredients together in food processor until butter is the size of coarse crumbs. Press firmly into parchment lined 9" x 13" (3.5 L) pan. Bake 20 minutes.
3
: For Topping, pour two thirds of sweetened condensed milk evenly over hot shortbread base. Sprinkle with remaining ingredients. Pour remaining sweetened condensed milk over top.
4
: Bake for 25-30 minutes or until lightly browned. Cool in pan on wire rack. Cut into bars.