1 cup milk
1 1/2 teaspoons ground cinnamon
2 drops vanilla extract, or more to taste
1 teaspoon mint leaves
3 scoops vanilla ice cream, or more to taste
Pour milk into a saucepan over medium heat. Add cinnamon, vanilla extract, and mint. Cook, stirring frequently, until flavors meld, 7 to 8 minutes. Reduce heat and simmer for 2 to 3 minutes. Pour into a bowl; cover and chill for 30 minutes.
Pour milk mixture and ice cream into a blender. Blend until smooth and thick.