Makes about 3 dozen cookies.
(Recipe from The Essence of Chocolate: Recipes for Baking and Cooking With Fine Chocolate (Hyperion, 2006) By John Scharffenberger and Robert Steinberg.)
Joanne Chang, chef and proprietor of the Flour Cafe in Boston, created these terrific cookies that get their tender centers and crunchy edges from a combination of all-purpose and bread flours. Cookies will are still delicios but much thinner if you use all-purpose flour in place of the bread flour.
Position the racks in the lower and upper thirds of the oven and preheat the oven to 350 degrees F. Line two baking sheets with Silpats or parchment paper.
Sift together both flours, the baking soda, and salt into a medium bowl. Set aside.
In the bowl of a stand mixer fitted with the paddle attachment, cream together the butter and both sugars on medium speed for about 5 minutes, or until pale, light, and fluffy. Scrape down the sides and bottom of the bowl as necessary. Beat in the eggs and vanilla until thoroughly combined. Scrape down the bowl. Reduce the speed to low, add the dry ingredients, and mix until the flour is completely blended, scraping the bowl as necessary.
Remove the bowl from the mixer and fold in the chocolate chunks until evenly distributed. (The dough can be refrigerated, well wrapped, for up to 1 week or frozen for up to 1 month.)
Drop the dough by heaping tablespoons, 2 inches apart, onto the prepared pans. Flatten each cookie slightly.
Bake for 15 minutes, or until golden, rotating the pans halfway through baking. Transfer the cookies with a spatula to a cooling rack to cool completely.
The cookies can be stored in an airtight container for up to 3 days.