01 -
Preheat oven to 350° F. Line 24 muffin tins with paper liners and set aside.
02 -
In large stand mixer or using a hand mixer, whip butter and sugar together until light and fluffy.
03 -
Stir in vanilla extract and eggs 1 at a time until combined. Using a rubber spatula, scrape sides of the bowl and mix again.
04 -
Slowly stir in all-purpose flour, self rising flour, and milk, alternating back and forth until all ingredients are added to the bowl.
05 -
Scrape sides and mix again briefly. Fold in chopped Oreo pieces by hand.
06 -
Scoop batter into prepared muffin tins so they are ⅔ full. Bake 18-22 minutes or until toothpick inserted comes out clean.
07 -
Using a hand mixer or stand mixer, whip butter and vanilla extract together in a large bowl. Mix in powdered sugar and then the milk.
08 -
Using a rubber spatula, scrape sides of the bowl and whip 1-2 minutes or until light and fluffy. Fold in crushed Oreos.
09 -
Frost cooled cupcakes and top with a mini Oreo.