Begin by boiling a large pot of salted water. Cook the lasagna noodles according to package instructions until they are al dente.
In a large skillet over medium heat, add olive oil and sauté the ground beef until browned. Season with salt, pepper, and Italian seasoning.
In a mixing bowl, combine ricotta cheese, egg, half of the grated Parmesan cheese, salt, and pepper.
Preheat your oven to 375°F (190°C). In a baking dish, spread a layer of marinara sauce on the bottom. Place three lasagna noodles over the sauce, then spread half of your ricotta mixture on top. Layer some sautéed meat followed by shredded mozzarella and more marinara sauce. Repeat these layers until all ingredients are used up, finishing with mozzarella and remaining Parmesan on top.
Cover your baking dish with foil and bake for about 45 minutes. Then remove the foil and bake for an additional 15 minutes until bubbly and golden brown on top.
Once out of the oven, let your lasagna rest for about 10 minutes before slicing. Garnish with fresh basil or parsley if desired.