1-Getting started with this Cookies N Cream Sheet Cake: Begin by preheating your oven to 350°F (177°C) and greasing a 9×13-inch cake pan to ensure easy release later. This step sets the stage for a perfectly baked cake every time.

2-Next: In a bowl, whisk together the 2 and 1/2 cups (285g) cake flour, 2 teaspoons baking powder, 1/2 teaspoon baking soda, and 1 teaspoon salt until well combined. This dry mix provides the base for your batter. In another bowl, use a mixer with a whisk attachment to beat the 3/4 cup (12 tablespoons; 170g) softened unsalted butter until it’s smooth and creamy, which takes about 1 minute.

3-Add: the 1 and 1/2 cups (300g) granulated sugar and beat for another 2 minutes until it’s fully creamed. Then, incorporate the 4 large egg whites at room temperature and beat on high for about 2 minutes until everything blends. Mix in the 3/4 cup (180g) sour cream at room temperature and 1 tablespoon pure vanilla extract, scraping the bowl as needed the mixture might look a bit curdled, but that’s okay.

4-Mixing and Baking Steps: Now, on low speed, add the dry ingredients to the wet mixture just until they’re incorporated, then slowly pour in the 3/4 cup (180ml) whole milk at room temperature while mixing on low. Be careful not to overmix to keep the cake light. Gently whisk by hand to remove any lumps and fold in the 1 and 1/4 cups chopped cream-filled cookies (110g).

5-Pour the batter: into your prepared pan and smooth the top with a spatula. Bake for 32 to 35 minutes, or until a toothpick inserted in the center comes out clean. Let it cool completely on a wire rack before moving on.

6-For the frosting: beat the 6 ounces (170g) full-fat brick cream cheese until creamy, then add the 3/4 cup (90g) confectioners’ sugar and 1 teaspoon pure vanilla extract, beating until smooth. Slowly add the 1 and 1/2 cups (360ml) cold heavy cream on low speed, then increase to high until stiff peaks form. Fold in the 1 cup chopped cream-filled cookies (90g) into most of the frosting, reserving some for piping if desired. Spread it over the cooled cake and enjoy!