1 3/4 cups all-purpose flour
1/2 teaspoon baking powder
1/4 teaspoon salt
1 stick unsalted butter, at room temperature
1/3 cup sugar
6 ounces white chocolate, chopped
1 large egg
1 teaspoon vanilla extract
4 teaspoons heavy cream
1 to 2 drops peppermint extract
1 candy cane or 6 hard peppermint candies, roughly crushed