Prepare dough from Easy Cut-Out Cookies recipe.
Divide dough in half. Roll each half into 7-inch log; press top to flatten to 3-inch width.
Place dough pieces, 3 inches apart, on baking sheet sprayed with cooking spray.
Bake 25 min. or until tops are lightly browned and firm to the touch. Cool 20 min.
Heat oven to 300°F. Place 1 biscotti log on cutting board; cut into 10 slices with serrated knife. Repeat with second log. Stand slices, 1/2 inch apart, on baking sheet.
Bake 30 min. Turn oven off. Let biscotti stand in oven, with door closed, 30 min. Remove biscotti from oven; cool completely.
Melt chocolate as directed on package. Dip tops of cookies, 1 at a time, into chocolate; gently shake off excess chocolate.
Place cookies, dipped sides up, on parchment-covered baking sheet. Sprinkle with nonpareils.
Refrigerate 15 min. or until chocolate is firm.