Preheat your oven to 400 degrees Fahrenheit.
In a medium bowl, combine softened cream cheese with sour cream, half of the Parmesan cheese, garlic powder, Italian seasoning, onion powder, and salt until smooth and creamy.
Pour about 1/4 cup of marinara sauce at the bottom of a 9x13 inch baking dish.
Arrange half of the frozen ravioli in a single layer over the sauce, then spread half of the cream cheese mixture on top followed by about one cup of shredded mozzarella cheese.
Spread half of the remaining marinara sauce over the mozzarella before repeating these layers one more time, finishing off with a sprinkle of mozzarella and Parmesan cheese on top.
Cover your baking dish with foil and bake for about 30 minutes before uncovering it; continue baking for an additional 10-15 minutes until the cheese is melted and bubbly!