Preheat your oven to 375°F (190°C). Grease a 9x13 inch baking dish with olive oil.
In a medium bowl, combine the ricotta cheese, beaten eggs, Parmesan cheese, 1 cup of the shredded mozzarella, parsley, salt, and pepper. Stir until well mixed.
Spread 1 1/2 cups of marinara sauce evenly over the bottom of the prepared baking dish.
Arrange 4 lasagna noodles on top of the sauce in a single layer. You may need to break a noodle to fit the pan.
Spread half of the ricotta mixture over the noodles. Top with 1 1/2 cups of marinara sauce.
Repeat the layering process once more: 4 noodles, the remaining ricotta mixture, and 1 1/2 cups of sauce.
Place the final 4 noodles on top and cover with the remaining 1 1/2 cups of sauce, making sure the noodles are fully submerged.
Sprinkle the remaining 2 cups of mozzarella cheese evenly over the top. Cover the dish tightly with foil.
Bake for 45 minutes. Remove the foil and bake for another 10-15 minutes, or until the cheese is melted, bubbly, and lightly browned. The center should be hot.
Let the lasagna rest for at least 10 minutes before cutting and serving. This helps the layers set.