Preheat oven to 400°F (204°C). Lightly grease a 9×13-inch baking dish.
In a skillet over medium heat, cook the ground beef until browned. Drain excess grease. Stir in marinara sauce and remove from heat.
In a large bowl, combine softened cream cheese, sour cream, ½ cup Parmesan, garlic powder, Italian seasoning, and salt. Mix until smooth.
Gently fold the frozen cheese ravioli into the cheese mixture until evenly coated.
Spread the ravioli mixture evenly into the prepared baking dish.
Pour the meat sauce evenly over the ravioli layer.
Sprinkle the remaining ½ cup Parmesan and 1 cup mozzarella cheese over the top.
Cover the dish with foil and bake for 30 minutes.
Uncover and bake for an additional 15 minutes, or until the cheese is bubbly and golden.
Let the casserole sit for 10 minutes before serving.
Notes
Vegetarian Option: Substitute ground beef with plant-based crumbles.
Make-Ahead Friendly: Assemble up to a day ahead and refrigerate until ready to bake.
Best Served With: A side salad and toasted garlic bread complete the meal.