Preheat oven to 350 F.
In the bowl of a stand mixer, cream the butter and sugar together until smooth and creamy, about 3-4 minutes on "medium" speed.
Add Karo® Corn Syrup, egg, and vanilla. Stir on low until fully combined.
Add salt, corn starch, cocoa powder, and flour. Stir on low to mix until just incorporated.
Add chocolate chips and pecans, and use a wooden spoon or spatula to gently mix them into the batter.
Make dough balls around 1-2 tablespoons in size, and bake for 9-11 minutes at 350 F. Allow to cool on the baking sheets for about 5 minutes, then transfer to wire racks to cool.