In a cup or container of your blender, add your vanilla ice cream, milk and melted marshmallows and blend until smooth.
To make chocolate ganache, pour your heavy cream into a glass measuring cup and microwave for 45 seconds.
Add in your chocolate and let sit in the heavy cream for about 5 minutes. Stir until smooth and the chocolate and heavy cream comes together.
Grab your milkshake cups or tall glasses and roll the rim in the chocolate ganache and drizzle the inside of your cup.
Sprinkle some graham cracker crumbs on the chocolate.
Pour your vanilla marshmallow milkshake into the cups and top with mini marshmallows or whipped cream, graham crackers, and extra chocolate ganache.
Share and enjoy!!