Make sure to wash and dry your kitty litter pan and scoop. Put the chocolate cake in, crush the vanilla creme cookies (put them into a ziploc bag and roll with a rolling pin until they are all crushed up). Pour the crushed cookies over the cake. Sprinkle lots of green sprinkles on top.
Get a microwave oven safe bowl and melt your Tootsie Rolls in the microwave. Use a spoon to shape them into shapes that belong in kitty litter!
Add them and your kitty litter dessert treat is done. All you have to do is serve it to your guests.