In a large sauté pan, brown ground beef and sausage over medium heat until meat is no longer pink, approx. 10-12 minutes. Drain fat, then stir in tomato sauce, chili beans, and chili powder.
Bring mixture to a boil, then reduce heat and simmer for 4-5 minutes. Spread cheddar cheese over pizza crust; top cheese with prepared beef mixture.
Cut desired shapes for jack-o-lantern face from cheese slices with knife and place onto pizza. Bake in preheated 425 degree F. oven for approx. 10-12 minutes or until chili topping is hot throughout and cheese is melted and bubbly.
Let pizza set for 5 minutes before slicing. Garnish slices with sour cream, cilantro, and sliced olives if desired.