Step 1

Line 2 baking sheets with parchment paper. In a mixing bowl, combine flour, salt, baking powder, and baking soda; set aside.

Step 2

In the bowl of a stand mixer fitted with the paddle attachment, cream together butter and sugars on medium-high until well combined, about 3 minutes. Scrape down sides of bowl, add corn syrup and beat for an additional minute. Add vanilla and egg; beat on medium high for 3 minutes.

Step 3

Add dry ingredients and mix on the lowest setting until flour is just combined. Add chocolate chips and chopped chocolate. Stir a few times until chocolate is evenly distributed.

Step 4

Roll 2-tablespoon portions of dough into balls and place 2 inches apart on prepared baking sheets. Refrigerate 1 hour.

Step 5

Preheat oven to 350°F. Bake cookies, rotating halfway through, until edges are lightly browned and the center is still soft, about 12 minutes. Transfer to wire rack to finish cooling.