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Preheat oven to 350 degrees. Make sure all your ingredients are room temperature.
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In a separate bowl, combine flour, salt, baking powder and soda and mix.
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In your mixer fitted with the paddle attachment, blend butter, sugar and vanilla at medium speed until pale and fluffy.
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Add eggs, one at a time, scraping the bowl after each addition.
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Reduce speed to low and add a cup of flour followed by ⅓ of the buttermilk.
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Repeat this 3 times, until you have incorporated all the flour and buttermilk.
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Stir in sprinkles.
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Put baking cups in pan and place an Oreo at the bottom of each cup.
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Fill cups with funfetti batter ⅔ full and gently tap on counter to remove air bubbles.
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Bake cupcakes for 15-17 minutes or until toothpick is inserted and comes out clean.
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Allow to cool completely before frosting.