In a large mixing bowl, sift together the powdered sugar and cornstarch. This ensures there are no lumps and creates a smooth foundation for your patties.
Pour in the sweetened condensed milk along with the peppermint and vanilla extracts. Use a spatula to gently mix the ingredients until a thick, cohesive dough forms.
If the dough feels overly sticky, gradually incorporate additional powdered sugar, a tablespoon at a time, until you achieve a smooth and pliable consistency that holds its shape.
Divide the dough into small pieces, roughly the size of a marble. Shape each piece into flat discs, about 1 inch in diameter and 1/4 inch thick, pressing down firmly to create uniform patties.
Place the discs on a parchment-lined baking sheet, ensuring there is space between each one. Transfer the baking sheet to the freezer for about 30 minutes, or until the patties are firm and set.
While the patties are chilling, prepare the chocolate coating. In a microwave-safe bowl, combine the dark chocolate chips and the coconut oil (or butter). Heat in the microwave at 30-second intervals, stirring well between each interval, until the mixture is completely melted and velvety smooth.
Once the patties are firm, take them out of the freezer. Dip each patty into the melted chocolate, ensuring they are fully coated. Allow any excess chocolate to drip off gently.
Return the chocolate-coated patties to the parchment-lined baking sheet. Continue this process until all patties are generously coated in chocolate.
For an extra festive touch, sprinkle crushed peppermint candies on top of the chocolate-coated patties before the chocolate sets. This adds a beautiful garnish and an extra crunch!
Let the patties sit at room temperature for a few minutes, or place them in the refrigerator to allow the chocolate to harden completely.
Notes
Arrange the finished peppermint patties on a decorative platter and garnish with fresh mint leaves for an eye-catching display. You might also consider wrapping some in colorful foil for a delightful gift!