Prep Time 20 minutes mins
Cook Time 10 minutes mins
Resting Time 4 hours hrs
Total Time 4 hours hrs 30 minutes mins
For the cleanest slices, chill the cake overnight so the graham crackers fully soften and the layers set firmly. If you prefer a less sweet glaze, reduce the sugar to 3/4 cup or add a tablespoon of hot coffee to deepen the chocolate flavor. Use full-fat milk and a stabilized whipped topping for best texture; if substituting fresh whipped cream, whip to medium-stiff peaks and serve within 24 hours. To prevent sticking, lightly mist the dish with nonstick spray before the first cracker layer. The glaze thickens as it cools, so pour while still spreadable, and rewarm gently if it becomes too stiff.