Place the milk and cream into a saucepan along with the mint leaves and warm over a medium heat, remove from the heat just before it boils and allow to infuse for 20 minutes or so
After 20 minutes place back on a medium heat and raise the temperature to near boiling again then remove from the heat
Meanwhile, place the sugar, egg yolks and vanilla extract in a large bowl and whisk until well combined. The mixture will become paler and increase in size after a couple of minutes
Strain the milk and cream mixture into a clean bowl to remove the mint leaves
Pour the slightly cooled milk and cream mixture very slowly over the egg mixture, making sure to whisk constantly until combined
Return the mixture into the pan on a low medium heat and keep stirring for 3-5 minutes until the mixture thickens a little. To test the thickening, dip a spoon into the custard and run your finger down the back. If it leaves a clean line and holds its shape somewhat, it is done
Remove from the heat, place in a bowl and cool to room temperature. Place it in an ice bath if you wish to speed up this process (See recipe notes) Stir frequently during the cooling process
Once cooled, if using an ice cream maker, follow user guidelines for best results. Once churned, place in a resealable, freezer-safe container and store in the freezer
If making this recipe manually, keep the cooled mixture in the ice bath and continue to whisk for 3-5 additional minutes depending on whether you’re mixing manually or with an electric whisk. Add the chocolate chips and mix briefly
Once this is done, scrape into your resealable, freezer-safe container. Place in the freezer for ½ hour. After ½ hour, remove and stir well using a spatula or spoon, making sure to scrape down the sides of the container and place back in the freezer. Repeat every ½ hour for the next 2 hours. After this repeat the stirring every hour until the desired consistency and smoothness is reached. Not only will this repeated stirring distribute the chocolate chips evenly but also discourage the formation of ice crystals and leave you with a delicious smooth ice cream