Preheat oven at 200°C
Remove the cream from the Oreo cookies, place the cookies in a ziplock bag, use a rolling pin, crashed the cookie into fine crumbs or into tiny pieces.
Sift flour into a big mixing bowl
Add all the remaining ingredients into the bowl and mix well (do not over stir, should be lumpy)
let the mixture stand for 20 mins
Fill batter into muffins cups ¾ full
Put some extra banana slices and oreo cookies as topping (optional)
Bake for 20 mins or till a toothpick inserted in the center and comes out clean.