Prepare the Crust: In a mixing bowl, combine melted butter, brown sugar, and all-purpose flour until the mixture resembles coarse crumbs. Press this mixture into a greased baking pan and bake at 350°F for 10-12 minutes until it turns lightly golden.

Make the Caramel Pecan Layer: In a medium saucepan, add the sweetened condensed milk and the chopped pecans. Cook over medium heat, stirring continuously until the mixture thickens and becomes gooey, about 5-7 minutes. Pour this caramel blend over the baked crust, spreading evenly.

Add the Chocolate Topping: Melt the chocolate chips in the microwave or over a double boiler until soft and pourable. Pour the melted chocolate over the caramel layer, smoothing it out with a spatula for an even finish.

Cool Completely: Allow the entire pan to cool at room temperature for at least 30 minutes before cutting into squares. This helps achieve clean slices and makes serving easier.