Preheat your oven to 350°F (175°C). Line 24 muffin tins with cupcake liners (or grease them if you’re feeling wild).
In a large bowl, combine the cake mix, vegetable oil (or butter), sour cream (or yogurt), eggs, vanilla extract, and espresso.
Use a hand mixer or stand mixer to beat the batter for 2-3 minutes until smooth and glossy.
Scoop the batter evenly into the cupcake liners, filling each about 2/3 full.
Bake for 20-25 minutes or until a toothpick inserted in the center comes out clean.
Let cool completely before frosting.
In a large bowl, beat cream cheese, butter, and vanilla extract until smooth.
Gradually add powdered sugar, mixing on low speed at first, then increasing to medium-high until fully combined and fluffy.
If the frosting is too thick, add a splash of milk. If too thin, add more powdered sugar.
Fold in the finely crushed Oreos.
Transfer frosting to a piping bag and generously frost each easy oreo cupcake. Top with half an Oreo for that extra WOW factor.