- In a medium bowl, whisk together both flours, salt, cornstarch, baking soda, and baking powder. Set aside for later. - 2 Cups Bread Flour, 1 ¾ Cups All-purpose flour, 2 Tablespoons Cornstarch, 1 teaspoon Sea Salt, 1 ¼ teaspoons Baking Soda, 1 ½ teaspoons Baking Powder 
- Using a stand mixer with the paddle attachment, begin mixing the butter, granulated sugar and brown sugar until light and fluffy (2 - 3 minutes on medium speed). Scrape the bowl as needed. - 1 ¼ Cups Unsalted Butter, 1 Cup Granulated Sugar, 1 ½ Cups Brown Sugar 
- Add the eggs, one at a time, to the mixing bowl. Mix on medium speed after each addition until combined, scraping the bowl as needed. - 2 Large Eggs 
- Add the flour mixture and mix on low speed just until combined. Be careful not to overmix, as this can make the cookies tough. 
- Stir in chocolate chunks by hand. - 18 Ounces Bittersweet Chocolate, chopped into ¼" to ⅓" chunks 
- Wrap the dough and place in refrigerator for a minimum of 2 hours.  Remove dough from the refrigerator approximately 15 minutes before baking to allow it to soften slightly. 
- Preheat oven to 350℉ (180℃) 
- Prepare 2 baking sheets by lining with parchment paper or silicone baking mats. 
- Using a cookie scoop (approximately 2 tablespoons per cookie) scoop individual cookies. 
- Place the dough on prepared baking sheets leaving approximately 2 inches of space between each cookie. 
- Sprinkle a dash of coarse sea salt over each cookie.  - 1 Tablespoon Coarse Sea Salt 
- Bake cookies for 12 - 14 minutes, or until tops and edges of cookies are browning. 
- Let cookies cool on the baking sheets for 5 to 10 minutes, then transfer them to a wire rack to cool completely. 
- Enjoy!