01 - In a blender, combine mashed bananas, whole milk, heavy cream, sweetened condensed milk, granulated sugar, vanilla extract, and salt. Blend until completely smooth.
02 - Transfer the blended mixture into a Ninja Creami pint container, seal, and freeze upright for at least 12 hours or overnight until fully solid.
03 - In a small mixing bowl, combine graham cracker crumbs, melted unsalted butter, and brown sugar. Mix until the texture resembles wet sand. Set aside.
04 - Place the frozen pint into the Ninja Creami and run on the 'Ice Cream' program according to manufacturer instructions.
05 - After the first spin, use a spoon to create a 1-inch well in the ice cream’s center. Add the prepared graham cracker mixture.
06 - Reinsert the pint and process with the 'Mix-In' setting until thoroughly combined.
07 - Scoop the finished ice cream into bowls. Top with whipped cream and sliced bananas as desired. Serve immediately for optimal texture.