Next, I made some to take to our granddaughters 14th birthday party; they were a hit there as well. It is unfortunate that these cookies are called Twix cookies, because they are vastly better than ANY Twix candy bar I've ever eaten. There is a sweet crispy shortbread cookie base, topped with a nice thick layer of caramel made from sweetened condensed milk, and then they are topped with your favorite flavor of melted chocolate. These cookies are totally addicting and the recipe is going straight into my FIVE STAR recipe folder.
1 cup cold butter
2 generous cups all purpose flour
heaping ½ cup brown sugar (I used dark)
Put all the of cookie ingredients into the food processor and pulse until it just starts to bind together. It won't go completely together, but if you watch it while you pulse, you will see the consistency change and small "clumps" appear.
Press this mixture into a parchment paper lined 9x13 baking dish (I left the ends of the parchment paper long, so I could grab them and lift the final product out of the pan for easier cutting). Bake in preheated 350F oven for 20-25 minutes or until edges are light golden. (see note below)
¾ cup butter
generous ½ cup brown sugar (I used dark)
3 tablespoons Karo corn syrup
14 ounce can sweetened condensed milk (not evaporated)
In a heavy bottomed saucepan, mix all of the caramel ingredients. Heat (and stir constantly) on medium high heat until it comes to a boil. At first, the melted butter will sort of float on top, but as it cooks (and you stir) it will incorporate. See note below for burner temperature suggestions. Reduce heat and simmer for 6-8 minutes, stirring constantly. Pour over pre-baked cookie base. Refrigerate until caramel layer is cold and firm to the touch.
Melt 12 ounces of your favorite flavor chocolate (I used milk chocolate) + a teaspoon of butter. Stir until smooth and pourable (I just melted mine in the microwave for 60 seconds). Spread over cooled caramel and return to the fridge to let the chocolate set (I actually speed set mine in the freezer).
Cut into small squares and serve. These are really rich, so I cut them into squares just a little bigger than 1" x 1".
NOTE: The recipe calls for "2 generous cups of flour"...whats up with that? I measured my flour and sugar in the standard way then added a tablespoon extra per cup. I'm not sure if that is what the original recipe meant, but it worked well for me.
NOTE: The ingredient amounts for the cookie crust are way off track in the original recipe. I only used about 2/3 of the crumbs for the cookie base and it was perfect. If you like a thick cookie base, use all of the crumbs.
NOTE: My burner settings go from 1 to 10. I brought the caramel ingredients up to a boil at setting 8 (medium high), then quickly turned it down to setting 5 (medium) for a couple of minutes, and finally ended up on setting 3 (low); cooking for a total of 6 minutes. The caramel will be pretty thick, so keep reducing the heat until the caramel. The caramel traps and holds the heat for a long time, so start turning down your burner before it gets to that wild-boil stage.
NOTE: I found this recipe (dated 2008) on a web page called The Domestic Side of Life.