Making the Cookies & Cream Sheet Cake is a breeze when you follow these simple steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C). Grease and flour a 9×13-inch sheet cake pan.
2. Mix Dry Ingredients: In a large bowl, sift together the flour, granulated sugar, cocoa powder, baking powder, and salt.
3. Combine Wet Ingredients: In another bowl, whisk together the milk, vegetable oil, eggs, and vanilla extract until well combined.
4. Combine Mixtures: Gradually add the wet ingredients to the dry ingredients, mixing until smooth and well incorporated.
5. Add Cookies: Fold in the crushed chocolate sandwich cookies gently into the batter.
6. Pour Batter: Pour the batter into the prepared sheet cake pan, spreading it evenly.
7. Bake: Place the pan in the preheated oven and bake for 30-35 minutes or until a toothpick inserted in the center comes out clean.
8. Cool: Remove from the oven and let the cake cool in the pan for about 30 minutes before transferring it to a wire rack to cool completely.
9. Prepare the Frosting: In a separate bowl, whip the heavy cream and powdered sugar until stiff peaks form.
10. Frost the Cake: Once the cake is completely cool, spread the whipped cream frosting evenly over the top.
11. Decorate: Sprinkle additional crushed cookies on top of the frosting for a decorative finish.

Following these steps will lead you to create a stunning and delicious Cookies & Cream Sheet Cake that everyone will love!