Preheat oven to 350 degrees F, line your cupcake pans with paper cupcake liners.
Zest and Squeeze the juice from one lemon. (We used ¼ cup juice- if you have less, make up the difference with a bit of water). Double check that the juice is free of lemon seeds. Set aside.
Sift the cake mix into your mixing bowl. Add the flour, lemon pudding mix, and sugar and combine.
Add all of the other ingredients to the bowl: zest and juice of one lemon, vegetable oil, sour cream, eggs, Limoncello, lemon extract, and milk.
Mix at low speed for about ten seconds to incorporate before increasing to medium speed for two minutes.
Scoop the batter into the paper lined cupcake pans. There will be approx. ¼ cup batter per cupcake. Bake for 15-18 minutes or until a toothpick comes out clean. **Baking times can vary- peek in as the end time approaches.
Optional: for more Limoncello flavor, lightly brush the tops of the freshly baked cupcakes with Limoncello, using a pastry brush.