Line a 9x13 inch baking dish with parchment paper, leaving overhang on the sides for easy removal.
Arrange broken chocolate fudge graham crackers in a single layer across the bottom of the pan.
Scoop half the vanilla ice cream over the graham crackers and press down firmly with a spatula to create an even, compact layer.
Pour hot fudge sauce over the ice cream layer and spread gently. Sprinkle 3/4 cup of peanuts evenly over the fudge.
Add remaining ice cream on top, pressing down firmly to seal all layers together. Scatter remaining peanuts over the surface.
Drizzle magic shell topping over the peanuts. Freeze for at least 3 hours or overnight before cutting into squares.