Fry the ground beef in a deep 10 or 12-inch skillet. Once the beef is cooked through drain the fat.
Add the marinara sauce and 1 cup of water to the ground beef and stir to combine.
Break the lasagna noodles into medium to large size pieces, then add them to the sauce. Stir very well so they are covered in the sauce.
Cover the skillet and let the pasta cook in the sauce stirring occasionally. The pasta may stick together so try to separate the noodles to ensure they are all cooked through. If the sauce seems too thick continue to add a bit of water to help the pasta cook.
In a medium size bowl add the ricotta cheese, the large egg, and the parsley. Mix until combined and set aside.
Once the pasta is cooked drop tablespoons full of the ricotta mixture into the sauce (you may not use all the mixture).
Once you're done adding the ricotta cheese swirl it a bit into the sauce.
Sprinkle the parmesan cheese over the entire skillet, then cover the entire skillet with the mozzarella cheese.
Sprinkle the black pepper over the mozzarella cheese.
Place the skillet under a broiler set on high for 5-10 minutes or until the mozzarella cheese has melted. (Keep an eye on the cheese so it doesn't burn).
Let the pasta cool for 10 minutes before serving.