Preheat the oven to 350ºF. Spray an 8x8-inch baking dish with nonstick cooking spray.

Place all of the Ritz crackers in a food processor and process until they are fine crumbs. Pour them into a bowl.

To the bowl of crackers, add 1 cup of the toffee bits and the can of sweetened condensed milk. Stir until combined. Press into the prepared baking dish. Bake for 10 minutes, then remove from oven.

Immediately pour the chocolate chips evenly over the top of the bars. Allow them to sit for a few minutes to melt, then spread evenly over the top. (If they aren't melting, stick the pan back into the oven for a minute or two.) Sprinkle on the remaining toffee bits. Allow to cool completely before cutting into squares.