Preheat the oven to 350 F degrees.
Line a muffin pan with cupcakes liners, set aside.
Using your mixer, beat the eggs and both the sugars together till creamy & pale in color, around 3-4 minutes.
Add oil, vanilla, and mix till combined.
Add the flour mixture and buttermilk in batches, starting and ending with flour.
Mix the batter till everything is well combined but do not over-mix.
Fold in the broken Oreo pieces, stir and combine.
Place an Oreo on the bottom of each cupcake liner or twist the Oreo and put a cookie at the bottom of the pan with cream side up.
Fill cupcake liners 2/3 full and bake for 15-20 minutes on until a toothpick inserted in the center comes out clean. Mine were done in 16 minutes.
Cool the cupcakes on wire rack before frosting them.