Chocolate-Stuffed Snickerdoodles

Heat oven to 375°F. In small bowl, mix sugar and cinnamon. Remove 2 tablespoons of mixture to second small bowl; reserve.

In large bowl, stir cookie mix, flour, softened butter and egg with spoon until soft dough forms. Shape dough into 20 (1 1/2-inch) balls. Flatten each ball to 2 1/2-inch circle. Press 1 chocolate into center of each cookie, making sure to form dough around chocolate to enclose; reshape into balls. Roll in remaining sugar-cinnamon mixture. Place 2 inches apart on ungreased large cookie sheets. Discard sugar-cinnamon mixture after rolling balls.

Bake 8 to 10 minutes or until edges are set and light golden brown. Cool 2 minutes; remove from cookie sheet to cooling rack. Sprinkle reserved 2 tablespoons sugar-cinnamon mixture on tops of warm cookies. Cool completely, about 30 minutes. Store covered in airtight container.