Add softened butter and sugar to a large mixing bowl. Beat until fluffy.
Beat in the Karo® Corn Syrup, eggs, and vanilla.
Gradually add in the flour, baking soda, cornstarch, and baking powder. Beat until completely mixed.
Stir in the chocolate chips and pecan pieces.
Drop heaping spoonfuls of dough onto a lightly greased baking sheet, spaced out about 2-3 inches.
Bake for approximately 10 minutes, until lightly browned. The middle of the cookies may not look done right out of the oven, but they will brown up quickly.
Remove from the pan and place them on a wire rack to cool.
Recipe by Nifty Mom at https://niftymom.com/2019/11/chewy-chocolate-chip-pecan-cookies/