1In large bowl, beat sugar and butter with electric mixer on medium speed until light and fluffy. Add egg and kirsch; beat until blended. On low speed, beat in flour, cocoa, baking powder, baking soda and salt until blended. Wrap dough in plastic wrap; refrigerate 1 hour.
2Heat oven to 350°F. Line cookie sheets with cooking parchment paper. Unwrap dough; shape into 1-inch balls. On cookie sheets, place balls 2 inches apart. Bake 10 to 12 minutes or until set. Immediately press 1 chocolate-covered cherry into center of each cookie. Cool 1 minute; remove from cookie sheets to cooling racks. Cool completely, about 30 minutes.
3In small microwavable bowl, microwave white chocolate uncovered on High 1 to 2 minutes or until softened and chocolate can be stirred smooth. Spoon melted chocolate into small resealable food-storage plastic bag; seal bag. Cut off tiny corner of bag; squeeze bag to drizzle chocolate over cookies. Let stand until set.