Preheat your oven to 350°F (180°C). Cook the lasagna pasta sheets according to the package directions, then set aside.
In a large skillet, heat the olive oil over medium heat. Sauté the finely chopped onion and garlic until softened and fragrant.
Add the ground beef and cook, breaking it up with a spoon, until browned on all sides.
Stir in the tomato puree, salt, pepper, and oregano. Reduce heat to low and simmer for 15-20 minutes, allowing the sauce to thicken.
In a separate bowl, whisk together the heavy cream, egg, and Parmesan cheese. Season with salt and pepper to taste.
Begin layering the lasagna: Spread a thin layer of meat sauce on the bottom of a baking dish. Top with a layer of lasagna pasta sheets, followed by more meat sauce, a drizzle of the cream mixture, and a sprinkle of shredded mozzarella cheese.
Repeat the layering process until all ingredients are used. Finish with a final layer of pasta sheets, meat sauce, and mozzarella cheese.
Bake for 30-40 minutes, or until the top is golden brown and bubbly.
Let cool slightly before serving. Garnish with fresh salad or garlic bread.
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