1Heat oven to 425ºF. Mix tomato sauce, oregano, basil, salt, garlic powder and pepper; set aside. Stir Bisquick mix and cold water until soft dough forms. Pat or roll dough into 12-inch circle on ungreased cookie sheet with hands dusted with Bisquick mix; pinch edge, forming 1/2-inch rim. Or pat dough in 12-inch pizza pan.
2Sprinkle 1/2 cup of the cheese over dough. Spread tomato sauce over top. Top with chicken and olives. Sprinkle with remaining 1 cup cheese.
3Bake 20 to 25 minutes or until crust is golden brown and cheese is bubbly. Garnish with avocado slices.