When ordering the cake, write on the order form that you want the cake "plain (borders only)". Indicate that you want the message written small in the center with the color of your choosing.

Break the Hershey bars into sections of 4 and 2.

Put the Oreos (whole, do not attempt to scrape out the white part) in a food processor and pulse until they're turned into crumbs.

Start by putting two 4 piece sections on the top center and bottom center of the cake. Build the large race track oval out from those points. You'll have to break some of the 2 piece sections into single sections. And you may have to grab a knife and trim a single section to fit. Do the same for the inner oval.

Grab the crushed Oreos and spoon them into the oval. Use the back of the spoon to smooth out the Oreos, creating a level race track surface. Use caution when applying the Oreos to the cake. But if you happen to get some crumbs on parts of the cake that shouldn't have Oreos, take a knife or toothpick and pick them off.

Place Hot Wheels cars driving counter clockwise on the race track.

Optional: Add two checkered flags.