Preheat your oven to 375°F (190°C).
Cook the lasagna noodles according to package instructions; drain and set aside.
In a skillet, heat olive oil over medium heat; add minced garlic and sauté for 1 minute.
Add ground beef to the skillet; cook until browned. Drain excess fat.
Stir in marinara sauce and Italian seasoning; simmer for 5 minutes.
In a bowl, mix ricotta cheese, egg, salt, and pepper until well combined.
Spread a thin layer of sauce on the bottom of a baking dish.
Layer 3 lasagna noodles over the sauce.
Spread half of the ricotta mixture over the noodles, followed by a third of the mozzarella and Parmesan.
Repeat the layers, finishing with noodles and remaining marinara and cheese on top.