Creating Cookies & Cream Sheet Cake is simple if you follow these easy steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C). Grease and line a 9×13 inch baking pan with parchment paper.

2. Mix Dry Ingredients: In a large bowl, whisk together the flour, granulated sugar, cocoa powder, baking powder, baking soda, and salt.

3. Combine Wet Ingredients: In another bowl, mix the milk, vegetable oil, eggs, and vanilla extract until well combined.

4. Combine Mixtures: Gradually add the wet ingredients to the dry ingredients, stirring until the batter is smooth and free of lumps.

5. Add Cookies: Fold in the crushed chocolate sandwich cookies until evenly distributed.

6. Pour Batter: Pour the batter into the prepared baking pan, spreading it evenly.

7. Bake: Place in the preheated oven and bake for 30-35 minutes or until a toothpick inserted in the center comes out clean.

8. Cool the Cake: Remove from the oven and allow the cake to cool in the pan for about 20-25 minutes. Then, transfer it to a wire rack to cool completely.

9. Prepare Frosting: In a mixing bowl, whip the heavy cream until soft peaks form. Gradually add the powdered sugar and continue to whip until stiff peaks form.

10. Frost the Cake: Once the cake is completely cool, spread the whipped cream frosting evenly over the top.

11. Add Topping: Sprinkle the remaining crushed chocolate sandwich cookies on top of the frosting for added texture and flavor.