Preheat oven to 375°. Mix brown sugar, granulated sugar, Country Crock spread, egg, egg yolk and vanilla into a large bowl until well mixed. Stir in flour, baking powder, salt and baking soda until blended (dough will be soft and creamy).
Add mix-ins into the dough until every spoonful of dough has some of the delicious mix-ins. (Try leftover Halloween candy, or use your favorite mix-ins such as dried fruit, HERSHEY’S Kitchens® baking chips, sprinkles, etc)
Drop dough by rounded tablespoonfuls onto ungreased baking sheets 3-inches apart. Bake 10 to 12 minutes until edges are lightly golden. Cool 1 minute on wire rack; remove from baking sheets and cool completely.