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Preheat oven to 320F/160C. Line 18 muffin cups with liner papers (use a standard muffin pan, not mini). Place one whole Oreo cookie at the bottom of each paper-lined muffin cups. Coarsely chop the other cookies and set aside.
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In a mixer fitted with the paddle attachment, beat cream cheese on medium speed until smooth, about 2 minutes. Add sugar and beat another 2 minutes. Add sour cream and vanilla extract and beat until smooth. Add eggs, one at a time, until fully combined. Scrape down the sides and bottom of the bowl as necessary. Fold in chopped Oreo cookies.
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Pour batter into muffin cups. Bake for 20 minutes until set (it’s ok if the center is slightly wobbly). Allow to cool completely, then refrigerate for at least 4 hours, preferably more. The cheesecakes may slightly sink at the center while cooling.
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You can discard paper liners and serve the cheesecakes upside down so that the cookie side is facing up.
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Store cheesecakes in an airtight container in the refrigerator for up to 5 days.