Preheat your oven to 350°F (175°C) and line a muffin tin with paper liners.
In a large bowl, mix granulated sugar and canola oil, then add sour cream and mix well.
In another bowl, whisk together flour, baking powder, baking soda, and salt.
Alternately add the dry ingredients and milk to the wet ingredients, stirring until just mixed.
In a clean bowl, beat egg whites until stiff peaks form, then carefully fold them into the batter.
Gently mix in broken Oreo pieces.
Pour the batter into the muffin tin, filling each liner two-thirds to three-quarters full.
Bake for around 17 minutes until a toothpick inserted comes out clean.
Let the cupcakes cool completely before frosting.
Prepare the frosting from our Cream Cheese Frosting recipe
To prepared frosting stir in crumbled Oreo cookies
Prepare the piping bag
Fill the bag about 2/3 of the way full with frosting
Pipe the cupcakes