Start with a large bowl and add the cake mix, eggs, vegetable oil, and water. Mix with hand mixer for about 2 minutes until all ingredients are combined.
Preheat the oven to 325 degrees. (See note)
Line a cupcake pan with the Halloween liners or any liners you have. Fill the liners a 1/3 full or about 2 tablespoons. (See note)
Bake the cupcakes for about 16-18 minutes or until a toothpick comes out clean. When cupcakes are done place them on a cooling rack and cool completely.
Here is where the fun begins. Take a sandwich bag and add the oreo cookies. Using a rolling pin or large can, crush the cookies until you have fine crumbs. (See note)
Frost the cupcakes with the chocolate frosting. Make sure that the frosting is at least room temperature for better spreadability. Then add some cookie crumbs to cover the surface of the cupcake. This will give the cupcake the look of dirt on the ground. The kids will love this part. Lol
Then add any spooky decorations you have. (See note)