In a medium saucepan, whisk together milk, cream, ½ cup sugar, and salt. Cook over medium heat until steaming. Add tea bags. Turn off heat, cover, and let steep for 5 minutes. Press tea bags slightly with a spoon before removing and discarding.
In a medium bowl, whisk together egg yolks and remaining ¼ cup sugar. Slowly pour warm cream mixture into yolks, whisking constantly. Pour mixture back into saucepan, and cook over medium heat, whisking until thickened and mixture coats the back of a spoon. Remove from heat. Strain through a fine mesh sieve into a bowl. Refrigerate until completely chilled, stirring occasionally, approximately 4 hours.
Freeze mixture in an ice cream maker according to manufacturer’s instructions. Transfer to a chilled airtight container, and freeze until firm, approximately 3 hours.
Garnish individual servings with a sprinkle of cinnamon, if desired.
Recipe by TeaTime Magazine at https://teatimemagazine.com/chai-spice-ice-cream-recipe/