Preheat oven to 350 degrees. Grease a 9x9" (or 8x8") pan with cooking spray and set aside.
Reserve 1/3 cup of toffee bits in a small bowl, set aside.
Pulse ritz crackers in food processor into a fine crumb. Pour into a large bowl and add sweetened condensed milk, chopped caramel bits and toffee bits. Stir until everything is evenly distributed. Dump mixture into prepared pan and press down VERY well into an even layer. Bake for 20-22 minutes or until the edges just begin to golden a bit. Once this happens, take the pan out of the oven, sprinkle chocolate chips evenly on top, and place back into the oven for 1 minute. Take the pan back out and spread the melted chocolate chips into an even layer. Sprinkle reserved toffee bits on top.
Allow bars to cool completely before serving. To speed the process up, I like to place them in the refrigerator or for even faster, the freezer.
These Caramel Toffee Bars will stay chewy and fresh for up to 6 days stored in an airtight container at either room temperature or in the refrigerator. If storing in the refrigerator, take them out 30 minutes before serving to allow them to come to room temperature.