Oreo cookie cake is a giant cookie stuffed with Oreos and decorated with vanilla buttercream frosting. This fun dessert comes together in 40 minutes and is everything you love about a cookie in cake form!
Preheat the oven to 350 F/180 C. Butter the bottom and sides or a 9-inch cake pan or springform pan. If using a cake pan, line the bottom with two long strips of parchment paper in the shape of an X, then place a parchment paper round to line the bottom. If using a springform pan, you only need to line the bottom of the pan.
In a stand mixing bowl or with a hand mixer, cream the butter, sugar, and brown sugar until fluffy, about 3 minutes.
Mix in the egg and egg yolk, one at a time, scraping down the bowl in between. Then, add the vanilla.
Mix in the flour, baking soda, and salt. When almost combined, add the chopped Oreos. Use an offset spatula to evenly spread the cookie dough into the prepared cake pan. Bake for 22-30 minutes, or until the top is golden brown and a toothpick inserted into the center comes out clean. Let the pan cool completely on a wire rack before removing.
Tip: if using a cake pan, have someone help you grab all of the strips of parchment up to remove the cookie from the pan. Then, pull the parchment off and place the cookie on a serving plate.
While the cake is cooling, cream the butter and powdered sugar until combined. Then mix in the heavy cream, vanilla, and salt. Beat on medium speed until light and fluffy.
Fill a pastry bag with the frosting and use a star tip to decorate the top of the cake. Garnish with sprinkles or chopped Oreos, and enjoy!
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Notes
*Measure your dry ingredients properly. This is my #1 baking tip! Do not ever scoop a measuring cup into your flour, as this always leads to using too much flour. Instead, use the spoon-level method. This means fluffing the flour first, then spooning it into your measuring cup/spoon. For the BEST results, use a kitchen scale!*Oreos: Try Golden Oreos, Java Chip, Halloween Orange, or other seasonal flavors! You can also add Heath bar or chocolate chips.Frosting: Try whipped cream, chocolate fudge frosting, cream cheese frosting, a drizzle of chocolate ganache, peanut butter, or Oreo frosting. You can even top it with scoops of ice cream for an even more delicious treat!Storage: This Oreo cake is best stored in an airtight container at room temperature for 3-4 days. It can be stored both with or without the frosting!Freezing: Store the cut slices or whole cake in an airtight container for up to one month. You can freeze it with or without the frosting on top.Make ahead: I don't recommend making the cookie dough ahead of time as it's best baked right after mixing. However, this cake is just as delicious on the second day as the first, so baking it the day before is perfect for prepping!