Salted Caramel Sweet Square Starbucks Wannabe!

Love at first bite!  While visiting the states this summer my good friend treated me to a little something something from Starbucks. A major treat because yea get this NO STARBUCKS here! I know feel sad for me. My pick was one of their Petites that are outrageoulsy priced but, oh so good.
When I got back home I was determined to figure out how to make these.  I think I have come close.

Salted caramel and chocolate filling with a layer of crisp pretzels and pecans on top of a shortbread crust.
Even though it has a lot of steps it's really easy.

Shortbread
1 1/2 cups all-purpose flour
1/4 cup sugar
12 tbl or 1.5 sticks of unsalted butter
1.5tsp Vanilla extract
for Caramel:
1 (14-ounce) can sweetened condensed milk
4 tbl light corn syrup
12 tbl unsalted butter

or I prefer
1cp store bought caramel (the kind for apples)
2-3 tbl of milk or heavy cream
for Chocolate
12 ounces semisweet chocolate
shortening optional

2cp of slightly broken up pieces of pretzels
1 cp of chopped pecans

Yup, there are 5 layers!
1st Layer- Shortbread
1. Preheat the oven to 325 degrees.
2. Put the flour and sugar into a bowl and rub in 12 tablespoons of the butter, form a ball.
3. Press shortbread mixture into a 9-inch square pan that has been greased smooth it with hands covered in plastic, otherwise it will constantly stick to your fingers. Poke with a fork and cook for 5 minutes, then lower the oven to 300 degrees, and cook for a further 30-40 minutes until it is pale golden and no longer doughy. This docking, as it’s called, will allow steam to escape during the baking, and keep your shortbread from bubbling up in patches. Let it cool in the pan.
2nd Layer- Pecans
 Put chopped pecans evenly over shortbread
3rd Layer -Caramel
In a small sauce pan, melt the remaining butter (12 tablespoons) for 2-3 minutes, then add the condensed milk and syrup. Whisk the mixture well until the butter is thoroughly incorporated.
Be careful to stir often. It’s ready when it’s thickened and turned a light golden brown. Pour this molten toffee evenly over the cooled shortbread and leave it to set.

If your using the store bought caramel (my preference) over low heat put caramel and milk in a saucepan and mix until smooth; constantly stirring. If its still too thick add the 3rd tbl of milk. Pour over shortbread and leave it to set.
4th Layer-Pretzels
Once caramel has cooled down put slightly broken up pieces of pretzels all over the top.
5th Layer- Chocolate
Break the chocolate into pieces and melt it in a bowl in the microwave.  Pour and spread it over the caramel mixture.