Preheat oven to 350 degrees. Spray a 9 by 12-inch baking pan with cooking spray.

In a large mixing bowl, whisk together the eggs, vegetable oil, and water. Slowly add the cake mix while whisking. Continue to whisk for another 2 minutes. Pour batter into prepared pan and bake for 25-30 minutes or until a toothpick inserted into the center comes out clean. Let cool in pan for 10 minutes then flip onto a cooling rack to cool completely.

Melt the chocolate chips in the microwave for approximately 90 seconds. Stir until smooth and glossy and let cool.

Put the butter in the bowl of an electric mixer, preferably fitted with the paddle attachment, and beat until smooth. Add 1 cup of powdered sugar and beat well. Scrape down the sides of the bowl and add the remaining powdered sugar, beating well. Add the cooled chocolate and vanilla and beat until fully incorporated, scraping down the sides of the bowl as needed.

Put the Kinni-Toos in a food processor and process until you have fine crumbs. Flip the cake onto a flat platter, top side down. Spread with the frosting. Top with the cookie crumbs.

Place the vanilla cookies to resemble headstones and decorate as desired.