In a large bowl or stand mixer, whip heavy cream until stiff peaks form.
Fold in sweetened condensed milk.
Slice up bananas and add to a skillet with a little butter and the brown sugar. Stir them around over medium heat for about 3-4 minutes.
Add graham crackers to a food processor or blender and pulse until they're just fine crumbs.
Stir graham crackers crumbs and Heath Pieces into whipped cream mix.
Stir in caramelized bananas.
Pour into two quart sized containers and evenly swirl in hot fudge and caramel sauce.
Place in the freezer to chill for at least 6 hours before serving.