Whisk together the milk, cream, sugar, egg yolks, cornstarch, corn syrup and salt.
1 ¾ cups whole milk, 1 ¼ cups heavy cream, 2 egg yolks, ¾ cup dark brown sugar, 1 ½ tbsp cornstarch, 2 tbsp light corn syrup, ½ tsp kosher salt
Place over medium high heat, stirring occasionally until the mixture starts to steam. Continue to whisk and bring the mixture to a boil. When boiling throughout, remove from heat. Pass through strainer if needed.
1 ½ tsp vanilla extract, 2 cups mashed ripe bananas
Cool off slightly, 5-8 minutes.
Pour into airtight container and chill 8-10 hours.
To freeze, remove from refrigerator and pour into ice cream freezer. Follow the directions with your freezer; each one can vary. My KitchenAid stand mixer (affiliate link) with ice cream maker attachment(affiliate link) takes about 20-25 minutes to freeze fully.
When finished, spoon into airtight container and place in deep freeze an additional 4-6 hours until hardened.