Preheat oven to 350°F. Grease and dust with flour three 9-inch cake pans, line with parchment paper rounds,
Make the cake: In a medium sized bowl, whisk the cake flour, salt, baking powder, and baking soda together. Set aside.
In a large bowl or stand mixer, beat the butter and sugar together on high speed until smooth and creamy, about 2-3 minutes. Scrape down the sides and up the bottom of the bowl with a spatula as needed. Beat in the 3 eggs, 2 egg whites, and vanilla extract on high speed until combined. Scrape down the sides and up the bottom of the bowl as needed. With the mixer on low speed, add the dry ingredients just until combined. With the mixer still running on low, pour in the buttermilk and mix just until combined. Lastly, mix in the golden oreo crumbs. Mix until well combined.
Pour batter evenly into cake pans. Weigh them to ensure accuracy, if desired. Bake for around 25 minutes or until the cakes are baked through. To test for doneness, insert a toothpick into the center of the cake. If it comes out clean, it’s done. Allow cakes to cool completely in the pans set on a wire rack. The cakes must be completely cool before frosting and assembling.
Make the frosting: In a large bowl, beat the butter on medium speed until creamy. Add confectioners’ sugar, milk, vanilla extract, golden oreos and salt with the mixer running on low. Increase to high speed and beat for 2 minutes.
Assemble the cake: Place 1 cake layer on your cake stand and evenly cover the top with 1 and ½ cups of frosting. Top with 2nd cake layer and evenly cover the top with about 1 and ½ cups of frosting. Top with the third cake layer. Spread the remaining frosting all over the top and sides. Garnish with golden oreos.
Refrigerate cake for at least 1 hour before slicing.