Prepare the Coffee Base: Brew a strong cup of coffee or espresso. In a mixing bowl, combine the brewed coffee, sugar, vanilla extract, and heavy cream. Whisk everything together until the sugar is fully dissolved and the mixture is smooth.
Chill the Base: Refrigerate the mixture for at least 2 hours to allow it to chill thoroughly.
Freeze the Mixture: After chilling, pour the mixture into the Ninja Creami pint container. Ensure the base is evenly spread. Place the container in the freezer and let it freeze for at least 24 hours.
Process the Ice Cream: Once the base is frozen solid, remove it from the freezer and place it in the Ninja Creami machine. Use the "Ice Cream" setting to churn the mixture into a creamy texture.
Add Mix-ins (Optional): After processing, you can add mix-ins like chocolate chips or nuts. Stir them into the ice cream or run the “Mix-ins” program to incorporate them evenly.
Serve and Enjoy: Serve immediately or transfer to an airtight container for later storage. If storing, let the ice cream sit out for a few minutes to soften before scooping.