In a saucepan, heat the heavy cream and whole milk over medium heat until it begins to simmer. Remove from heat just before it boils and set aside.
In a mixing bowl, whisk together the egg yolks and sugar until the mixture becomes pale and slightly thickened.
Slowly pour the warm cream mixture into the egg yolk mixture while continuously whisking to avoid curdling. This forms the custard base.
Pour the custard back into the saucepan and return it to low heat. Stir constantly until the mixture thickens and coats the back of a spoon (about 5-7 minutes). Be cautious not to boil it.
Remove from heat and stir in the vanilla extract. Allow the custard to cool to room temperature, then cover and refrigerate for at least 4 hours or overnight.
Once the custard is thoroughly chilled, pour it into your ice cream maker and churn according to the manufacturer's instructions. Usually, this takes about 25-30 minutes.
During the last few minutes of churning, add in the Butter Brickle candy bits to evenly distribute them in the ice cream.
Transfer the churned ice cream to an airtight container, sprinkle extra Butter Brickle bits on top for a delightful crunch, and freeze for a few hours until it reaches your desired consistency.