SALTY BUCKWHEAT CHOCOLATE CHUNK COOKIES

Steps:

• Heat butter in a small saucepan over the lowest heat possible until melted (you don't want it to sputter or brown), about 5 minutes.
• Meanwhile, whisk both flours, baking powder, baking soda, and 1¼ tsp. Diamond Crystal or ¾ tsp. Morton kosher salt in a medium bowl.
• Scrape butter into a large bowl and add brown sugar and granulated sugar. Whisk vigorously until butter is absorbed into sugar, about 30 seconds. Add egg, then egg yolks, one at a time, whisking to combine after each addition; whisk in vanilla. Mixture should look much lighter in color and be almost creamy.
• Add dry ingredients and use a rubber spatula or wooden spoon to stir until just incorporated and almost no dry streaks remain. Set aside a handful of chocolate, then add remaining chocolate to batter. Gently mix just to evenly distribute. Cover bowl with a kitchen towel (a silicone lid or plastic wrap also works) and chill 2 hours.
• Place racks in upper and lower thirds of oven; preheat to 375°F. Line 2 baking sheets with parchment. Using a tablespoon, scoop out 2-Tbsp. portions of dough (or, if you have one, this is a leveled-off #30 cookie scoop or a heaping #40) and place 5 on each baking sheet, spacing evenly. Roll into balls and gently press 2-3 pieces of reserved chocolate onto the top of each one. It's okay to jam the chocolate on there-some pieces can even be vertical. Cover and chill any remaining dough.
• Bake cookies, rotating baking sheets top to bottom and front to back halfway through, until edges are golden brown and centers are puffed, 8-10 minutes.
• Working one at a time, pull baking sheets out of the oven and tap lightly on the stove to deflate cookies. Sprinkle with Diamond Crystal kosher salt (if you're using Morton, skip it: the crystals are too large). Let cookies cool on baking sheets 5 minutes, then transfer to wire racks and let cool completely.
• Let baking sheets cool, then turn parchment paper over. Repeat process with remaining dough, dividing evenly between baking sheets, to make 6-8 more cookies.
• Do Ahead: Cookies can be baked 3 days ahead. Let cool; store airtight at room temperature.