Preheat oven to 350 degrees Fahrenheit.

Line a large rimmed baking sheet with foil. Arrange a single layer of saltine crackers over the foil. Set aside.

Combine the butter and sugar in a medium saucepan over medium heat. Stirring constantly, bring the mixture to a rolling boil and boil for 1 to 2 minutes, or until the mixture is thick and glossy. Do not stir while the mixture is boiling. Immediately pour the sugar mixture over the layer of saltines, spreading it evenly to cover the crackers completely.

Place the baking sheet in the preheated oven and bake for 8 to 10 minutes or until bubbly all over. Remove from oven and immediately sprinkle chocolate chips over the top. Let it rest for 3 minutes to let the chocolate chips soften.

Sprinkle with the chopped pecans and chopped toffee bar pieces. Refrigerate for at least one hour, then break the cracker toffee into pieces.