Preheat oven to 400 degrees.
In a medium bowl mix together the softened cream cheese with the sour cream, ½ cup of the parmesan cheese, garlic powder, Italian seasoning, onion powder, and salt.
Pour about ¼ cup of marinara sauce onto the bottom of a 9x13 inch baking dish.
Place half of the frozen ravioli in a single layer on top of the marinara sauce.
Top with half of the cream cheese mixture, and about 1 Cup of mozzarella cheese.
Spread half of the remaining marinara sauce on top of the mozzarella.
Repeat these layers one more time ending with a sprinkling of mozzarella and parmesan cheese.
Cover dish with foil and bake in preheated oven for 30 minutes.
Uncover and bake for another 10-15 minutes until cheese is melted.