Mix together the sweetened condensed milk, cocoa powder and salt.

In a mixer, whip on high the heavy cream until you have stiff peaks.

Gently fold the cream into the cocoa mixture until just combined.

Place the mixture into a metal loaf pan and freeze for 2 hours.

After 2 hours remove the ice cream and mix in the graham cracker chunks and mini marshmallows.

Place back into the freezer for at least another 3 hours until it the ice cream reaches the desired firmness.