Preheat oven to 350°F, line muffin tin, place Oreo at bottom.
Mix dry ingredients in one bowl.
Whisk wet ingredients in another bowl.
Combine wet and dry ingredients, fold in chopped Oreos.
Divide batter into muffin tin, bake 18–20 minutes, cool completely.
Beat butter, add powdered sugar, cream, vanilla, and salt until fluffy.
Fold in crushed Oreos, frost cooled cupcakes, decorate with whole Oreos and sprinkle with extra crumbs.