Heat oven to 350°F. Line two large baking sheets with parchment paper. Melt half of the morsels; set aside.
Mix together flour and baking powder. In medium bowl, with electric mixer on medium, beat sugar, eggs, corn syrup, and extract until thick, about 3 minutes. Gradually beat in melted chocolate, then dry ingredients. Mix in remaining morsels; freeze 10 minutes.
Drop heaping tablespoonfuls of batter, 3 inches apart, on baking sheets (cookies will spread). Refrigerate remaining dough. Bake cookies 12 minutes. Quickly sprinkle tops with chopped candies; bake 3 to 5 minutes more, until cookies are softly set.
Cool cookies on baking sheets 5 minutes. Transfer to wire racks and cool.