In a large bowl, mix sweetened condensed milk, graham cracker crumbs, shredded coconut, chocolate chips (if using), vanilla extract, and salt until well combined
Chill the mixture in the refrigerator for 15-20 minutes to firm up
Roll the mixture into small bite-sized balls
Coat each ball by rolling it in the extra shredded coconut
Refrigerate for at least 30 minutes before serving for the best texture