Prep mixing bowl. In the bowl of a stand mixer, add 56 g cold butter, brown sugar, granulated sugar, vanilla, instant espresso, and cinnamon. Set aside.
Brown the butter. In a heavy bottomed sauce pot, melt remaining 114 g butter over medium heat. Continue cooking, swirling as needed, until the milk solids turn golden brown and has a nutty fragrant aroma.
Combine. Pour the hot brown butter over the sugar mixture in mixing bowl. Make sure to include all the browned bits in the butter pan. Let sit for 5 minutes.
Beat. Using the paddle attachment, beat together on medium speed for 2 minutes. Add egg and egg yolk. Beat on medium for 3 minutes.
Whisk dry ingredients. While mixer is running, whisk together whole wheat flour, salt, and baking soda in a separate bowl.
Finish dough. Add flour mixture to mixing bowl. Mix on low speed until just combined. Fold in chocolate until distributed.
Chill. Cover and refrigerate dough overnight. The dough will be very firm the following day.
Portion and freeze. Let dough sit at room temperature for about an 1 hour until soft enough to scoop. Portion with a #24 scoop. Place cookie dough mounds on sheet tray. Cover and freeze until solid, at least 2 hours. Keep frozen until ready to bake.
Bake from frozen. Preheat the oven to 350℉. Line baking sheet with parchment paper. Place frozen cookie dough mounds on baking sheet, spacing them at least 2 inches apart. Bake for 16 minutes, rotating pan midway through baking.
Finish and cool. Sprinkle Maldon sea salt flakes over hot cookies. Cool cookies in pan for 5-7 minutes before un-molding cookies and transferring to wire rack to cool further.