Preheat oven to 350°F. Mix coconut, sweetened condensed milk, liqueur and pumpkin pie spice in large bowl. Drop by heaping teaspoonfuls onto greased baking sheets.
Bake 10 to 12 minutes or until edges are lightly browned. Immediately remove from baking sheets to wire racks; cool completely.
Dip bottom of each cooled cookie in melted chocolate. Let stand on wax paper-lined tray until chocolate is set. Store in airtight container up to 1 week.