First, I measured all my ingredients carefully. I like to have everything at room temperature—it makes mixing smoother and the cake fluffier. Preheat your oven to 350°F (175°C) so it’s ready when the batter is done.
I combined dry ingredients in one bowl and wet ingredients in another. Slowly mixing them together, I added the red gel food coloring and crushed Oreos, folding gently to keep the batter light and airy.
I divided the batter evenly into greased 9-inch pans and baked each layer for about 30-35 minutes. I always check with a toothpick—it should come out clean. Let the cakes cool completely on racks before frosting.
I beat cream cheese and unsalted butter until smooth, then added powdered sugar and vanilla. Once fluffy, I folded in crushed Oreos for a perfect cookies-and-cream frosting that’s thick enough to hold the layers.
I leveled the cake layers with a serrated knife, then stacked them with a generous amount of frosting between each layer. After covering the whole cake with frosting, I decorated with extra crushed Oreos and cake crumbs for that classic look.