01 - In a large mixing bowl, whisk together heavy cream, whole milk, and granulated sugar until the sugar is fully dissolved.
02 - Add peppermint and vanilla extracts to the mixture and stir until evenly distributed.
03 - If desired, divide the mixture into two bowls; tint one portion with green food coloring, leaving the other plain.
04 - Alternate spoonfuls of each mixture into a loaf pan or freezer-safe container, then use a knife to create a swirling pattern.
05 - Cover the container tightly and freeze for a minimum of 2 hours until the dessert is firm.
06 - Scoop into bowls or glasses; top with crushed peppermint candies and whipped cream if desired, then serve immediately.