Add the heavy cream to the bowl of a stand mixer fitted with the whisk attachment. Start on low speed and gradually work up to high speed, beating the cream until it forms stiff peaks, about 3 minutes.
Add the sweetened condensed milk and vanilla extract and fold them into the whipped cream gently; you don’t want to deflate the whipped cream.
Next, add the crushed graham crackers, mini marshmallows, and chocolate chips and fold them in.
Transfer the mixture to a 9x5-inch loaf pan or silicone ice cream tub and wrap it tightly with plastic wrap. Freeze for at least 12 hours, preferably overnight.