In a medium mixing bowl, stir together the white whole wheat flour, baking powder, baking soda, salt, and espresso powder. Fold in the Andes mints or baking chips.
Scatter the flour mixture over the top, and, by hand with a wooden spoon or sturdy rubber spatula, stir to combine. Stop as soon as the flour disappears so that you don’t overwork the dough. If the dough seems very dry, add 1 to 2 teaspoons of milk until it comes together. (It will become moist faster than you think!)
Clear space in your freezer and line 2 baking sheets with parchment paper or silicone baking mats. With a cookie scoop or spoon, portion the dough by 1 1/2 tablespoonfuls (the dough balls will be about 1 1/2 inches across). Arrange on the baking sheets, leaving at least 2 inches of space around each cookie. Freeze for 30 minutes or refrigerate for 24 hours. Alternatively, you can cover the bowl of dough with plastic wrap, then refrigerate it in the bowl for 24 hours or up to 3 days. Let stand the bowl stand at room temperature for 10 minutes, until the dough is softened enough to scoop, then portion as directed.
When ready to bake, place racks in the upper and lower thirds of your oven and preheat the oven to 350 degrees F. Bake on the upper and lower racks for 11 to 12 minutes, until barely dry on top and just turning golden on the edges, switching the pans’ positions once halfway through. The cookies will look underdone but will firm up as they cool. (You can also bake the pans one at a time in the center rack of your oven.)
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