Line your cookie sheet with parchment paper or grease with butter.
Cover the cookie sheet (with sides) with Saltines in a single layer.
Combine the sugar and the butter in a saucepan and bring to a boil.
Boil for 3 minutes.
Immediately pour over the Saltines and spread to cover the crackers completely.
Bake at 400℉ for 5-6 minutes.
Take out of the oven and sprinkle the chocolate chips over the top.
Let it sit for 5 minutes and then spread the melted chocolate evenly.
Top with the chopped pecans.
Cool completely and break into pieces.
Notes
Line the Baking Sheet: Use parchment paper or a silicone baking mat to line your cookie sheet. This makes cleanup a lot easier and prevents the toffee from sticking. At the very least, grease the cookie sheet with butter.Spread the Crackers Evenly: Arrange the saltines in a single layer without overlapping to ensure an even base for the toffee.Pour and Spread Quickly: Once the toffee mixture is ready, pour it evenly over the crackers and spread it quickly with a spatula—it sets fast!Melt the Chocolate Smoothly: Sprinkle chocolate chips over the hot toffee and let them sit for 2-3 minutes to soften before spreading into a smooth layer.Cool Completely: Let the toffee cool completely at room temperature, or put it in the fridge for faster setting. Break it into pieces only after it's fully hardened.