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Heat olive oil in a pan over medium heat. Add chopped onion and cook until soft. Stir in garlic and cook for about a minute. Add ground beef and cook until browned, breaking it apart as it cooks.
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Add crushed tomatoes, tomato paste, salt, pepper, oregano, and basil. Stir well and let the sauce simmer on low heat for about 20 minutes until it thickens slightly.
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In a bowl, combine ricotta cheese, egg, Parmesan, and salt. Mix until smooth and set aside.
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Preheat your oven to 180°C. In a baking dish, spread a thin layer of meat sauce at the bottom. Place a layer of lasagna sheets on top.
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Add a layer of meat sauce, then spread some of the ricotta mixture, and sprinkle mozzarella cheese. Repeat the layers until all ingredients are used, finishing with sauce and mozzarella on top.
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Cover with foil and bake for 30 minutes. Remove the foil and bake for another 15–20 minutes until the top is golden and bubbling.
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Let the lasagna rest for 10–15 minutes before slicing. This helps the layers set and makes serving easier.