Here's the recipe

Kitty Litter Cake is one of my absolute favorite Halloween desserts to make! It looks very realistic, but if you can get over how disgusting it looks it actually tastes really good. mary Kitty Litter Cake 1 German chocolate cake mix 1 white cake mix 1 large package vanilla instant pudding mix 1 package vanilla sandwich cookies Green food coloring 12 small Tootsie Rolls 1 new (unused!!!) kitty litter pan 1 new (unused!!!) Pooper Scooper Prepare cake mixes and bake according to directions. Prepare pudding mix and chill until ready to assemble. Crumble white sandwich cookies in small batches in food processor, scraping often (I put them in a ziploc bag and crushed them with a rolling pin before putting them in the food processor). Set aside all but about 1/4 cup. To the 1/4 cup cookie crumbs, add a few drops green food coloring and mix. When cakes are cooled to room temperature, crumble into a large bowl. Toss with half the remaining white cookie crumbs and the chilled pudding. (Mix in just enough of the pudding to moisten it. Combine gently). Put mixture into litter box. Put three unwrapped Tootsie rolls in a microwave safe dish and heat until soft and pliable (only takes a few seconds). Shape ends so they are no longer blunt, curving slightly. Repeat with 3 more Tootsie rolls and bury in mixture. Sprinkle the other half of cookie crumbs over top. Scatter the green cookie crumbs lightly over the top. (This is supposed to look like the chlorophyll in kitty litter.) Heat 3 Tootsie Rolls in the microwave until almost melted. Scrape them on top of the cake; sprinkle with cookie crumbs. Spread remaining Tootsie Rolls over the top; take one and heat until pliable, hang it over the side of the kitty litter box, sprinkling it lightly with cookie crumbs. Take a picture, then show your guest, then dish it up and enjoy.