Preheat the oven to 350 degrees.

In a bowl, mix together the butter, flour, sugar, and salt. When the mixture makes a ball in your hands when you pat it together, it's ready.

Place a piece of tin foil in a 9x13 pan and spray the foil with a non-stick spray.

Firmly pat the shortbread crust down into the bottom of the pan as evenly as possible. Bake the crust for 13 minutes and then remove from the oven.

Sprinkle the chocolate chips, coconut, and caramel bits over the top of the crust.

Pour the sweetened condensed milk over the top as evenly as possible.

Bake for an additional 20 minutes or until the top begins to become golden brown.