Pre-heat oven to 350 degrees F.
In a medium bowl, mix together 8 ounces cream cheese, 1 Tablespoon Parmesan and ¼ teaspoon oregano, ¼ teaspoon basil, ¼ teaspoon red pepper flakes, ¼ teaspoon garlic powder. Spread mixture into the bottom of an oven safe 9-inch glass pie plate.
Top cream cheese mixture with ½ cup mozzarella and spread 1 cup pizza sauce over it to edges. Sprinkle remaining ½ cup mozzarella, ½ cup cheddar and ½ cup Parmesan cheese over the sauce.
In a small sauté pan, cook 1 sausage over medium heat until no longer pink, breaking up into small pieces. Remove sausage from pan with slotted spoon and spread over top of cheese in pie plate.
In same pan you cooked the sausage, add 10 sliced mushrooms and ½ diced onions and cook until just golden (add a little oil or butter if needed). Remove mushrooms and onions from pan and spread over other ingredients.
Sprinkle 20-30 mini pepperoni, ½ diced bell pepper, 10 sliced black olives over the top, adding more if desired. For a little spicier dip, sprinkle with extra red pepper flakes before baking.
Bake for 15-20 minutes or until the cheese is golden brown and bubbly.
Serve immediately with crostinis, garlic toast or sliced baugette.