Freeze a shallow metal pan for 30 to 60 minutes
Mix heavy cream, milk, sugar, and vanilla in a bowl
Pour the mixture into the cold pan
Stir every 30 minutes while freezing
Scrape the frozen edges into the center each time
Repeat until thick and creamy
Transfer to a container and freeze until firm
Use a whisk, hand mixer, or blender to speed up mixing if needed
Add fruit, chocolate, or cookies before the final freeze
Use a zip-top bag with ice and salt for a no-machine shake method
Blend frozen bananas for a simple no-churn ice cream alternative