Preheat oven to 350 degrees. Line a 9x9 pan with foil and spray with non-stick baking spray. Set aside.

In a food processor, add 2 cups of pretzels and the pecans. Pulse a few times to break up the pieces. Add the brown sugar, flour and baking soda and pulse several times to combine completely. Pour out mixture into a mixing bowl and pour in the melted butter and stir to combine. (You can also pour in the butter while the food processor is still running to combine.) Press mixture into the bottom of the prepared pan, and bake at 350 degrees for 12-14 minutes.

While crust is baking, melt caramels with 2 tbsp of milk in microwave. Heat at 1 minute at 50% powder. Stir. Heat for 30 seconds at 50% power and stir. Repeat until completely melted and smooth. In a separate bowl, melt 1 cup of dark chocolate in microwave or double boiler. Melt in microwave the same method as the caramels.

Once crust comes out of the oven, sprinkle on 1 c. unmelted chocolate chips. Pour the melted caramel over the chocolate chips. Next drizzle the melted chocolate over the caramel, and spread evenly. Lastly, top with whole pretzels, four accross and four down, for 16 equal squares.

Let bars set before slicing. Store leftovers in airtight container at room temperature.