Preheat your oven to 350°F.
Heat olive oil in a skillet over medium heat. Add ground beef and cook until browned. Season with salt and pepper. Drain any excess fat.
Pour in the marinara sauce and let it simmer for 5 minutes with the beef.
In a separate bowl, mix cream cheese and sour cream until smooth.
Grease a 9x13-inch baking dish. Spread a layer of the beef sauce on the bottom.
Add a layer of frozen ravioli, then spread a layer of the cream cheese mixture on top.
Sprinkle with mozzarella cheese. Repeat layers until all ingredients are used up.
Top with Parmesan cheese.
Cover with foil and bake for 30 minutes. Then uncover and bake another 10-15 minutes until golden and bubbly.
Let it rest for 10 minutes before serving.