Preheat oven to 350 degrees. Line a standard-sized cookie sheet that has built up sides with aluminum foil. Lightly spray the foil with cooking spray.
Arrange saltine crackers over foil to make a single layer. Cut crackers to fill in gaps where whole crackers will not fit. Set aside.
In a medium saucepan, combine butter and sugar and bring to a boil. Boil 1 minute. Remove from heat and pour gently over crackers, spreading the mixture to cover every single one evenly.
Bake in preheated oven for 10 minutes or until lightly golden brown. Do not allow to get dark brown, or sugar and butter can burn. Remove from oven and rearrange any crackers that have moved while mixture is still warm and loose.
Immediately sprinkle chocolate chips evenly over the top of the crackers. Wait 2 to 3 minutes, and the chocolate will begin to soften and melt. Using a spatula or butterknife, spread melted chocolate evenly to cover the crackers. Cool on wire rack, then refrigerate for a few hours. Remove from refrigerator about 15 minutes before serving. Cut or break into pieces. It makes lots. Enjoy!
*A "Brutzel" boil is a gentle, lazy, bubbling on the surface.