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Preheat oven to 350°F and line a muffin pan with cupcake liners.
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Twist Oreos in half (like you did as a kid) and save the side without the middle for extra cookies for crushing for the frosting.
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Place the side with cream filling in the bottom of each cupcake liner, cream-side facing up.
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Cream butter and sugar in the bowl in a stand mixer.
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Combine flour, baking powder and salt in a medium bowl.
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Add eggs to the stand mixer, one at a time, and beat after each addition.
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In a container, combine the buttermilk and vanilla.
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Alternately add the dry ingredients and the liquid ingredients to the batter, beginning and ending with the dry ingredients.
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Fill lined cupcake tins with the batter.
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Bake for 15-18 minutes, until tooth pick inserted in the middle of a cupcake comes out clean.
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Allow to cool 10 minutes in pan before transferring to a cooking rack.