Adjust an oven rack to the middle position. Preheat the oven to 350°F. Line 3 baking sheets with aluminum foil, dull side up.
In a medium bowl, whisk together the flour, espresso, salt, and baking soda.
In the bowl of a stand mixer fitted with a paddle, beat the butter at medium speed until creamy, about 1 minute. Add the sugar, and beat until fluffy, 2 to 3 minutes. With the mixer on low, add the molasses, egg, and vanilla, beating to combine. Add the flour, and beat on low until combined. Using a spatula, make sure the molasses is completely combined into the dough and that the dough is uniform in color.
Add the chocolate, and stir to combine. Shape the dough into 3 ounce [85g] balls. Place 4 balls an equal distance apart on on the prepared pans.
Place the baking sheet in the oven and bake 8 minutes, until the cookies are puffed slightly in the center. Lift the side of the baking sheet up about 4 inches and gently let it drop down against the oven rack, so the edges of the cookies set and the inside falls back down.
After the cookies puff up again in about 2 minutes, repeat lifting and dropping the pan. Repeat 3 or 4 more times to create ridges around the edge of the cookie. Bake 14 to 15 minutes total, until the cookies have spread out and the edges are golden brown but the centers are much lighter and not fully cooked.