Preheat your oven to 350°F (180°C).
Line a muffin tin with 12 cupcake liners.
In a large bowl, sift together 1 ½ cups + 2 tablespoons all-purpose flour, ½ teaspoon baking soda, ½ teaspoon baking powder, ¼ teaspoon salt, and 2 to 3 teaspoons gingerbread spice mix. Set aside.
In a large measuring cup or medium bowl, stir together ⅓ cup unsulfured molasses and ½ cup buttermilk. Set aside.
In a large mixing bowl with an electric mixer or the bowl of a stand mixer with the paddle attachment, cream ½ cup unsalted butter, softened, and ½ cup packed brown sugar until light, fluffy, and pale in color, about 3 minutes.
Beat in 2 eggs, one at a time, incorporating well. Add 1 teaspoon vanilla extract and mix.
Add half of the dry ingredients mixture to the butter mixture, lightly mix without incorporating fully, then pour in the buttermilk-molasses mixture and mix until just barely incorporated. Finish with the rest of the dry ingredients. Mix just until everything is combined and smooth, but avoid overbeating. Do so at the lowest speed.
Scoop the batter into the cupcake liners, dividing evenly and filling each about ¾ full.
Bake for 15-20 minutes, or until a toothpick or cake tester inserted into the center comes out with a few moist crumbs, but not a wet batter.
Remove from the oven and allow cupcakes to cool completely on a wire rack before frosting.