Preheat the oven to 375 F and set aside two loaf pans (or one larger baking dish).
Combine the ricotta with 1/4 cup of mozzarella cheese, olive oil, and egg. Set aside.
Using a large pan, brown the ground beef on medium heat and along with onion and garlic. Season with parsley, oregano, salt, and pepper. Once cooked, pour in 2 cups of tomato sauce. Stir well to combine and remove from the heat.
Fill a large pot with water and bring to a boil. Add the lasagna sheets about 2 at a time and cook until lightly tender. The sheets should be easy to bend and al dente, but not soft or mushy. Coat lightly with olive oil and set aside.
Add a few spoonfuls of the meat sauce to the bottom of the pans (just enough to cover).
Prepare the lasagna roll-ups by laying out a lasagna sheet and adding a few spoonfuls of the cheese mixture, a few spoonfuls of the meat sauce, and then rolling up into a roll. Transfer to the baking pan and repeat with all of the lasagna sheets.
Top the lasagna rolls with the remainder of the tomato sauce and evenly spread. Sprinkle with the remainder of the mozarella cheese.
Transfer to the preheated oven and bake for 35-40 minutes or until fully cooked. Serve topped with fresh parsley.