Preheat your oven to 350°F (175°C) and grease an 8x8 inch baking pan with butter or cooking spray. In a mixing bowl, combine cold butter, brown sugar, and all-purpose flour. Mix until the mixture resembles coarse crumbs. Press this crust mixture evenly into the bottom of the prepared baking pan.

Bake for about 15 minutes, or until the crust turns lightly golden at the edges. Remove the pan from the oven and let it cool slightly.

Carefully pour the caramel sauce over the slightly cooled crust and spread it out smoothly. Sprinkle the pecans generously over the caramel layer.

In a microwave-safe bowl, melt the chocolate chips in 30-second increments until smooth. Pour the melted chocolate over the caramel-pecan layer and spread evenly.

Allow the Turtle Bars to cool completely at room temperature. You can also refrigerate once at room temperature to expedite the cooling.