In a small medium mixing bowl add the egg yolks and ½ a cup of the granulated sugar. Whisk vigorously until the egg yolks are a pale yellow and the sugar is mostly dissolved. Set aside.
In a medium sauce pan add the rest of the granulated sugar, the milk, heavy cream, cream cheese & salt. Stir over medium heat until the mixture comes to a gentle simmer and the cream cheese is fully melted. You may either use a mixing spatula, gently pressing the cream cheese against the sides of the saucepan to help it blend in or use an immersion blender.
Once the heavy cream mixture has come to a simmer temper the egg yolks by adding a cup of the heavy cream mixture at a time while continually whisking to avoid any hotspots that can cause the yolks to "scramble."Repeat this until the entire heavy cream mixture is incorporated.
Return the mixture to the saucepan and over low-medium heat, continue to stir until the mixture thickens and coats the back of a spoon/spatula. Be careful not to overheat the the custard at this point as the yolks can still scramble. The custard will be ready at 160°F.
Strain the finished custard through a fine mesh sieve into a large heat resistant bowl. Add the vanilla then cover with lid or plastic wrap.
Chill in the refrigerator for a minimum of 6 hours or up to 3 days before churning. Make your funfetti "mug" cake during this time.
Funfetti Birthday "Mug" Cake
Add all the ingredients to a large bowl microwave-safe bowl and mix until smooth. The batter should only take up a third of the bowl's total volume as it will expand during heating.
Microwave for 2 minutes then immediately cover with an airtight lid or by pressing plastic wrap to the surface of the cake to prevent it from drying out and becoming brittle.
Once the cake has completely cooled, crumble and set aside in an airtight container or Ziploc bag until ready for layering.
Funfetti Birthday Ice Cream Assembly
Churn the ice cream according to your ice cream maker manufacturer's instructions. This ice cream took 38 minutes in my Whynter Ice Cream Maker.
Once the custard base has finished churning layer the ice cream in your container of choice starting with a layer of ice cream then sprinkling crumbles of the funfetti mug cake set aside earlier.
Repeat the layering process until all the ice cream & the funfetti mug cake have been used then cover with a lid or plastic wrap and allow to set in the freezer undisturbed for a minimum of an hour before enjoying!
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